The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]

Since its launch in 2009, Node.js has become one of the fastest-growing open-source, cross-platform Javascript run-time environment and therefore, many Node.js web frameworks were created. Each framework is catered to the demands of users and developers, such as to improve productivity, scalability, enhance the speed of applications and performance capability. With the advantages of being lightweight, scalable and many others, no wonder Node.js web frameworks are rapidly gaining attention and becoming the go-to option for developers at the present.

In this article, we will introduce the three most popular web frameworks in Node.js (Express, Koa and Hapi) and how to differentiate them to pick the right one for your project.

Today you’ll learn: 

  • Full faces of Express, Hapi and Koa frameworks.
  • The differences among them.
  • Why they form a squad of biggest popularity.
  • The best framework for your business strategy.

Heat up yet? Let’s start the learning journey!
The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]

1. What are Express, Hapi and Koa?

To keep you from dropping dead before the mind-boggling information later in this blog, I’ll flash through the basics of each of the 3 frameworks as following:

1.1. Express

Express is a code-centric web application framework that aims to provide developers with a simple, performant, and unopinionated toolset for creating web application servers. The API is kept lightweight and maintains a high degree of consistency with the NodeJS core API. Because of its minimalist nature, many common tasks require outside modules.

Having been in development since 2009, Express is a mature project with a strong community backing. With +43000 stars on GitHub and about 8 millions npm weekly download, Express has proved its reign as the most loved and widely used Node.js web application framework. The latest version of Express is 4.17.1 published in May 2019. The publisher also announced on its 5.0 version, which is currently in the alpha stage, promising the upcoming dawn of Express 5 universe.

1.2. Hapi

Hapi is a feature-rich framework that favours configuration over code and attempts to cover a wider range of use cases out of the box. It was originally created by a member of WalmartLabs, and it is intended for large teams and large projects. Because of this, it can be a bit boilerplate-heavy for small projects.

While Hapi is less widely used and slightly newer than Express (Hapi started development in 2011), Hapi is used by a variety of large companies such as Walmart, Disney, and Macy’s. It has more than 11000 stars on GitHub and over 250000 npm downloads each week.

1.3. Koa

Koa is a new web framework designed by the team behind Express, which aims to be a smaller, more expressive, and more robust foundation for web applications and APIs. By leveraging async functions, Koa allows you to ditch callbacks and greatly increase error-handling.

Koa does not bundle any middleware within its core, and it provides an elegant suite of methods that make writing servers fast and enjoyable. It scores quite impressive stars on GitHub: +25000, earning approximately 300000 npm weekly downloads as of today despite its being one of the newborns in the Node.js game.

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2. KOA vs EXPRESS vs HAPI: A Detailed Comparison

Let’s differentiate the three most popular Node.js frameworks to find which is the best for your project. Here are some of the criteria that we think you should take into consideration:

  • Basic Setup
  • Middleware
  • Installation
  • Performance
  • PROs and CONs
  • Community

2.1. Basic Setup

Here comes the start of the complicated part. Because Express, Happi and Koa are all unique in each’s own way, with several distinctive traits and functionalities. The basic set up is not an exception. To start off, let’s make a new server, tell it to start listening to port 3000, and have it log a message when it has done so.


The basic setup in Express is pretty straightforward. The express module returns a function (with some helper methods attached) which will return a new Express app. The return value of app.listen is an instance of HTTP.server.

Just look at these codes as an example:

const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;
const server = app.listen(PORT, () => {
console.log(`Express is listening to http://localhost:${PORT}`);


The basic setup for Hapi looks very similar to that of Express, although Hapi’s focus on configuration over code is already beginning to make an appearance. After instantiating a new Hapi server, we add a connection, providing it with the port via a configuration object. Then, we simply start the server.

For example:

const Hapi = require('hapi');
const PORT = process.env.PORT || 3000;
const server = new Hapi.Server(PORT);
server.start(() => {
console.log(`Hapi is listening to http://localhost:${PORT}`);


Because Koa was given birth by the same team as Express, the basic setup of those two can be quite confusing at first glance.

const koa = require('koa');
const app = koa();
const PORT = process.env.PORT || 3000;
const server = app.listen(PORT, () => {
console.log(`Koa is listening to http://localhost:${PORT}`);

Right away you can see the similarities., but essentially you just required Koa instead of Express. We even have the same app.listen() wrapper function. Still, what makes Koa really separates from Express, as introduced in the first part, is its way to ditch callback completely by either using ES6 function generators or the newer async/await control flow. It also eliminates much of the middleware that Express uses, which at some points become even more dominant than Express.

2.2. Middleware

One of the major concepts Node developers are used to is working with middleware. Middleware functions are functions that sit in between requests and responses. They have access to the request and response objects and can run the next middleware after they’re processed.

To understand the competency of each, let’s take a look at how they’re defined in the different frameworks by implementing a simple function that logs the time a request is made to the server.


Registering middleware in Express is as simple as binding the middleware to the app object by using the app.use() function.

For instance:

app.use((req, res, next) => {
console.log(`Time: ${Date.now()}`);


In Hapi there are certain extension points in the request lifecyle. The server.ext() method registers an extension function to be called at a certain point in the request life cycle.

We make use of the onRequest extension point in the example below to register a middleware (or extension) function:

server.ext('onRequest', (request, h) => {
console.log(`Time: ${Date.now()}`);
return h.continue;


Middleware registration in Koa is similar to Express. The major differences are that the context object (ctx) is used in place of the request and response objects in Express and Koa embraces the modern async/await paradigm for defining the middleware function.

Take this as an example:

app.use(async (ctx, next) => {
console.log(`Time: ${Date.now()}`);
await next();

2.3. Installation

The installations of Express, Koa and Hapi are also differentiated as below:


For installing Express, you need to have already installed Node.js. If you want to install Express in a specific directory and save it in the dependencies list:

$ npm install express --save

However, if you want to install Express temporarily and not add it to the dependencies list, you can use:

$ npm install express --no-save


To install Hapi, you need to have Node.js installed and then:
$npm install Hapi
to save it to your package.js on dependencies.


Koa requires node v7.6.0 or higher for ES2015 and async function support. You need to have already installed Node.js. You can quickly install a supported version of Node.js with your favourite version manager:

$ nvm install 7
$ npm i koa
$ node my-koa-app.js

2.4. The “Hello World” Example

To dig even deeper, let’s take a “Hello World!” example, put it as listening on port 3000 and responds “Hello World”.


This is the most basic example of how to create an express app that listens on port 3000 and responds “Hello World”. For every other path, the server will respond with 404 Not Found.

const express = require('express')
const app = express()
const port = 3000app.get('/', (req, res) => res.send('Hello World!'))app.listen(port, () => console.log(`Example app listening on port ${port}!`))


The following example is the most basic hello world app using Hapi. Then you just launch the application by running npm start and open localhost: 8000/hello in your browser.

'use strict';const Hapi=require('hapi');
// Create a server with a host and port
const server=Hapi.server({
// Add the route
handler:function(request,h) {
return'hello world';
// Start the server
const start = async function() {
try {
await server.start();
catch (err) {
console.log('Server running at:', server.info.uri);


This is the most basic example of a “Hello World!” app on Koa that listens on the port 3000. For every other path, the server will respond with 404 Not Found.

const Koa = require('koa');
const app = new Koa();app.use(async ctx => {
ctx.body = 'Hello World';

2.5. Performance

The performance is, for the most parts, one of the most important parameters for you to evaluate its quality as well as the suitability of it to your business model. In this part, we are going to elaborate on the performance of each of them so that you could have a thought on the framework you think the best you should choose.


Express provides a thin layer of fundamental web application features, without obscuring Node.js features that are familiar.

The best practices for improving express performance includes:

  • Use gzip compression.
  • Don’t use synchronous functions.
  • Do logging correctly (for debugging, use a special module like debug, for app activity use winston or bunyan).
  • Handle exceptions properly, using try-catch or promises.
  • Ensure your app automatically restarts by using a process manager or use an init system like systemd or upstart.
  • Run your app in a cluster. You can increase the performance of a Node.js app greatly by launching a cluster of processes (a cluster runs multiple instances of the app, distributing the load and tasks among the instances).
  • Cache request results, so that your app does not repeat the operation to serve the same request repeatedly.
  • Use a load balancer to run multiple instances of it and distribute the traffic, like Nginx or HAProxy.
  • Use a reverse proxy that performs supporting operations on the requests. It can handle error pages, compression, caching, serving files, and load balancing among other things.

A simple “Hello World” app has the following performance request per second:

The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]

Maybe You Like To Know: 10 major mistakes when developing on Node.js


A 2017 study on Node.js frameworks, showed that Hapi performed the worst compared to the other frameworks.

The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]

As we can see in the following graph compared to Express.

The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]

  • Express continues to maintain a performance edge over Hapi.
  • Applications with significant performance requirements should consider the advantage Express has over Hapi.

A simple “Hello World” app has the following performance request per second:
The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]


With Koa, you can build web apps with great performance. This is because you can stop using callbacks, deal with errors faster, and because Koa itself is a very lightweight framework. As well as that, it makes the code management process easier.

It’s important to take into account the best practices for having a better performance in Node.js like running things in parallel, use asynchronous APIs in your code, keeping code small and light, and using gzip compression.

A simple “Hello World” app has the following performance request per second:

The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]

READ MORE: How to Hire the Best Node.js Developers: The Ultimate Guide

2.6. Pros & Cons of Each Framework

Understanding that you might be tired after reading the wall of text I’ve just written above and because it is too long of information for you to swallow, you probably missed out somewhere; I will summarise the upper and lower hands of each so that you’re easier to compare among three of them.


The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]

  • Advantages

Express has the biggest community of users out of all existed web application frameworks for Node.js, with a history of over 9 years of development behind it. Many of its members praise that Express is a good and powerful tool, and it does do a good job.
Because of its simplicity, Express is very user-friendly and can be applied successfully by inexperienced people. It also helps simplify the testing process and improve application performance.
Despite that, with a powerful rooted API, various tasks can be performed including building an Express RESTful API server and routes for simple web applications. Additionally, it’s extremely easy to integrate with third-party services and middleware as Express makes use of the Node.js manager package node.

  • Disadvantages

While it is a convenient and easy-to-use tool, Express does have some drawbacks. One of those is the lack of a recommended method of organisation, which can be a problem for developers as they’re unable to repair the projects if needed.
Therefore, it is important to be very clear about the approach when maintaining the code. Furthermore, Express required a lot of manual labour-intensive tasks since you need to create all endpoints. Unless it’s handled professionally, the problem can affect a great deal to your memory usage.

  • Recommendation

For small and middle-size projects, Express would be a suitable option. Some of the examples that can be named are MySpace, PayPal and Klout sites, which all use the Express web framework as a middleware framework.
However, if you’re going to develop a complex project with a large development team, Express may not be the best tool to use.

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The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]

  • Advantages

Hapi is Node.js framework with a powerful provided plugin system, therefore developers can add new features or fix bugs at a fast pace. As well as that, Hapi can assist you to manage the whole development process easier.

As Hapi allows developers to have deeper control over request handling, building large scale or enterprise-sized applications is a piece of cake. On top of that, as this framework is based on configuration rather than code, Hapi adds consistency and reusability to the developing process.

  • Disadvantages

Apart from being a useful tool in creating customized construction blocks, Hapi does have a considerable minus. This framework relies heavily on manual labour, which means you’re on your own to figure out how to use them.

There are a lot fewer samples or open-source applications that use Hapi, so the project may involve developers more than when using third-party middleware.

  • Recommendation

As Hapi is tailored towards big and complex web applications, if you’re in the process of building one app like that, you should definitely go for this framework. With the back-up of WalmartLabs and many other large companies that have already used Hapi, you can rest assured that this web framework has been tested and ready for any heavy tasks.


The Best Node.js Framework: Koa VS Express VS Hapi [Detailed Comparison]

  • Advantages

By taking advantage of ES6 generator feature, using Koa will help you avoid callbacks and build web applications with great performance. Besides, it makes the coding management process easier. Hence, you can easily handle errors faster.

Moreover, with just over 500 lines of code, Koa is an extremely lightweight framework, making it a special point of this tool. Overall, Koa brings a faster and easier experience when picking (or writing) middleware for first-timers, rather than compromising with middleware like Express or Hapi.

  • Disadvantages

Despite its pros, Koa still presents some hindrances. As it is the newest out of three frameworks (Express, Koa and Hapi), the open-source community revolving around Koa is relatively small. Therefore, it suffers a shortage of support from its web framework community.

In addition, Koa is still unstable. Using the ES6 generator, which is way above of the game, means that Koa framework is not compatible with any types of Node.js framework middleware existed.

  • Recommendation

As Koa is a lightweight and modular framework, you can create a web application from scratch, upon request and without tonnes of unwanted materials.

READ MORE: Node.js in Web Development – Key benefits


There is no “best” framework among Express, Hapi and Koa. They are equally distinctive, remarkably unique and constantly innovative while keeping the nature of Node.js as being light-weight, scalable and performant. They are all excellent framework, in their own different ways.

That being said,  it’s a battle with all three of them co-awarding the first prize, with each of them comes with both pros and cons, advantage and drawbacks as well as various distinctions in core competency, basic setup, middleware, installation and community.

What really matters is you choose “the one” for your business – the framework that matches your products, your business goals, strategy and organisation. Otherwise, it means nothing even if you pick out the most popular or the fastest performing one.

To do that, you shall:

  • Make a list of core traits of your business (such as your company structure, business goals, development strategy, product competency, target market, etc).
  • Read carefully the above information to pinpoint the nature of each framework, which can be optimised by the below bullet points:

– Express: Lightweight and minimalist, supported by most middleware, seems to be the defacto standard.

– Koa: Great async/await support for asynchronous flow. Seems to be ‘the new hotness’.

– Hapi: Great for larger-scale projects out of the box, but has some extra middleware to deal with.

  • Analyse the information about your company in comparison with those above bullet points to strategically decide on the most suitable for your business. Remember, just because it is popular doesn’t mean it is going to make you “happy” – sometimes a “less impressive” one is all you need for a long, healthy relationship.

Make sure you fully understand the differences and carefully collate your business to it, so that you won’t regret choosing a dull one later! If you are still confused about which framework you shall apply for the best business efficiency, feel free to contact us for professional consultations! We would be happy to help you make a leap in the industry.

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10 major mistakes when developing on Node.js

Ever since it was first introduced, Node.js has met with a mixed response, getting both criticism and extolment. Controversy over the advantages and disadvantages of this tool has lingered for several years and has yet to show sign of subsiding. What we often lose sight of, however, is the fact that most criticism we make against a language or a platform is largely based on how we use them. Regardless of how much Node.js complicates the writing of secure code and facilitates its parallelization, the platform has been around for quite some time, and it has created a huge number of reliable and complex web services, all of which have demonstrated scalability and sustainability.
But, like any other platform, Node.js is not immune to the mistakes of the developers. In some cases, performance drops, while the system becomes practically unusable in others. This post will discuss the 10 most common mistakes made by developers with insufficient experience with Node.js and how to fix them.
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Mistake #1: Blocking the event loop

 JavaScript in Node.js (as in the browser) provides a single-threaded environment. This means that two or more parts of your application cannot run simultaneously. Parallelization is carried out due to asynchronous processing of input/output operations. For example, querying Node.js for a database for a document allows Node.js to focus on another part of the application:

// Trying to retrieve user data from the database. From now on, Node.js is free to execute other parts of the code. db.User.get (userId, function (err, user) {
// .. until the user data is retrieved here

However, a piece of processor-occupying code can block the event loop, causing thousands of connected clients to wait for completion. An example of such code is an attempt to sort a very large array:
Node.js error 1 - 2
Calling the sortUsersByAge function is unlikely to cause problems in the case of a small array. But when working with a large array, this will catastrophically reduce overall performance. Problems may not arise if this operation is absolutely necessary, and you are sure that no one else expects an event loop (say, if you are making a tool that is launched from the command line, and asynchronous execution is not needed). But for a Node.js server serving thousands of clients at the same time, this approach is unacceptable. If this user array is retrieved directly from the database, then the best solution would be to retrieve it already sorted. If the cycle of events is blocked by the cycle of calculating the overall result of a large number of financial transactions, then this work can be delegated to some external executor so as not to block the cycle of events.
Unfortunately, there is no silver bullet to solve problems of this type, and each case requires an individual approach. The main thing is not to overload the processor as part of the execution of the Node.js instance, which simultaneously works with several clients.

Mistake #2: Calling a callback more than once

JavaScript is based on callbacks. In browsers, events are processed by passing links to functions (often anonymous) that act as callbacks. Earlier in Node.js, callbacks were the only way to link the asynchronous parts of the code with each other until promises were implemented. However, callbacks are still in use, and many package developers still use them when designing their APIs. A common mistake is to call a callback more than once. Usually, a method that does something asynchronously expects a function that it will call after the completion of its asynchronous task:
Node.js error 2 - 1
Note the return statement after each “done” call, with the exception of the last. The fact is that calling a callback does not interrupt the execution of the current function. If you comment out the first “return”, passing this function a password that is not a string will result in a call to “computeHash”. And depending on the further scenario of the operation “computeHash”, “done” can be called multiple times. Any unauthorized user using this function can be taken by surprise by calling a callback several times.
To avoid this error, just be vigilant. Some developers made it a rule to add the keyword “return” before each callback call:
Node.js error 2 - 2
In many asynchronous functions, the return value is not important, so this approach often avoids calling the callback multiple times.

Mistake #3: Deeply Nested Callbacks

 This problem is often called the Callback Hell. Although this in itself is not an error, it can cause code to quickly get out of hand:
Node.js error 3 - 1
The more complex the task gets, the deeper the nesting can be. This leads to unstable and hard-to-read code that is difficult to maintain. One way to solve this problem is to separate each task into a separate function, and then link them together. At the same time, many people find it best to use modules that implement asynchronous JavaScript patterns, such as Async.js:
Node.js error 3 - 2
In addition to “async.waterfall”, Async.js also contains a number of other functions that enable asynchronous JavaScript execution. For the sake of brevity, a fairly simple example is presented here, but more often than not, everything is much worse in reality.

Mistake #4: Expecting that callbacks will be executed synchronously

 Asynchronous callback programming is not unusual for JavaScript and Node.js. Other languages might​​accustom us to the predictability of the execution order, when two expressions are executed sequentially, one after another if there are no special instructions for moving between them. But even in this case, we are often limited to conditional statements, loops, and function calls.
However, in JavaScript, callbacks allow you to make sure that a certain function may not be executed until a certain task is completed. Here the function will execute without stopping:
Node.js error 4
When calling the “testTimeout” function, “Begin” will be displayed first, then “Waiting”, and after about a second – “Done!” If something needs to be done after calling the callback, then it must be called in the callback itself.

Mistake #5: Assigning “exports” instead of “module.exports”

 Node.js treats each file as a small, isolated module. Let’s say your package contains two files a.js and b.js. In order for b.js to access functionality from a.js, the latter must export this functionality by adding properties to the “exports” object:
Node.js error 5 - 1
If this is done, then any a.js request will return an object with the “verifyPassword” function in the properties:
Node.js error 5 - 2
And what if we need to export this function directly, and not as a property of any object? We can do this by overriding the “exports” variable, but the main thing is not to access it as a global variable:
Node.js error 5 - 3
Pay attention to “exports” as a property of the “module” object. The difference between “module.exports” and “exports” is very large, and a misunderstanding of this leads to difficulties for beginner Node.js developers.

Mistake #6: Error generation inside callbacks

 JavaScript has a concept like exception. Imitating the syntax of almost all traditional programming languages, which also have exception handling, JavaScript can generate and catch exceptions using try-catch blocks:
Node.js error 6 - 1
However, in cases of asynchronous execution, try-catch will not work as you expect. For example, if you try to protect an impressive piece of code with numerous asynchronous segments using a large try-catch block, then this may not work:
Node.js error 6 - 2
If the callback passed to db.User.get is called asynchronously, the try-catch block will not be able to intercept the errors generated in the callback because it will be executed in a different context than the try-catch context. Errors in Node.js can be handled in different ways, but you must adhere to one template for the arguments of all function (err, …) callbacks – the first argument in each callback is to expect an error if any.

Mistake #7: Assuming that all numbers are integers

 JavaScript does not have an integer data type, here all numbers are floating-point numbers. You may think that this is not a problem since numbers that are not large enough to cause problems due to floating-point restrictions are not common. This is a delusion. Since floating-point numbers can contain integer representations only up to a certain value, exceeding it in any calculation immediately leads to problems. Oddly enough, this expression in Node.js is regarded as true:
Node.js error 7 - 1
 The oddities with numbers in JavaScript don’t end there. Despite the fact that these are floating point numbers, they work with operators designed for integer data:
Node.js error 7 - 2
However, unlike arithmetic, bitwise operators and shift operators work only with the last 32 bits of such large “integer” ones. For example, if you shift “Math.pow (2, 53)” by 1, then the result will always be 0. If you apply bitwise OR, it will also be 0.
 Node.js error 7 - 3
Most likely, you rarely encounter large numbers, but when this happens, use one of the many libraries that perform precise mathematical operations with large numbers. For example, node-bigint.

Mistake #8: Ignoring the benefits of streaming APIs

Suppose you need to create a small proxy server that processes responses when requesting any data from another server. Say, for working with images with Gravatar:
Node.js error 8 - 1
In this example, we take an image with Gravatar, read it in Buffer, and send it as a response to the request. Not a bad design, as these images are small. But what if you need to proxy gigabyte-sized content? It is better to use this method:
Node.js error 8 - 2
Here we take an image and simply transmit it as a response to the client, without reading the entire buffer.

Mistake #9: Using Console.log for debugging 

Console.log allows you to output anything to the console. Pass it an object, and it will print a JavaScript object to the console. Console.log accepts any number of arguments and displays them, neatly separated by spaces. Many developers are happy to use this tool for debugging, but it is recommended not to use “console.log” in real code. Avoid “console.log” even in commented outlines. It’s better to use libraries specially written for this, like debug. Using these libraries, you can easily enable or disable debugging mode when starting the application. For example, when using “debug”, if you do not set the appropriate environment variable DEBUG, then the debug information will not get to the terminal:
Node.js error 9 - 1
To enable debug mode, just run this code by setting the DEBUG environment variable to “app” or “*”:
Node.js error 9 - 2

Mistake #10: Not using dispatcher programs

Regardless of whether your code runs in production or in your local environment, it is highly recommended that you use a dispatch program. Many experienced developers believe that code should “crash” quickly. If an unexpected error occurs, do not try to handle it, let the program crash so that the dispatcher restarts it within a few seconds. Of course, this is not all that dispatchers can do. For example, you can configure the restart of the program in case of changes in some files, and much more. This greatly facilitates the development process on Node.js. The following managers are recommended:

Each production process manager has its own pros and cons. Some work well with several applications on the same machine at the same time, while others are better at logging. But if you want to start using the dispatcher, then you may choose any of the proposed ones.

Development mistakes can have a devastating effect on your program; some can cause frustration when implementing the simplest of things in Node.js. Although Node.js is simple enough for a beginner, there are many points where you might easily mess up. If you are familiar with other programming languages, then you might already be aware of a wide range of development errors. However, these 10 errors listed above are typical for beginner Node.js developers. Fortunately, they are fairly easy to avoid. I hope this short article helps novice developers write stable and efficient applications for all of us.
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Node.js features – Will they be better?

For Node.js developers, it is an earnest expectation to improve the function of this cross-platform, run-time environment. Not only the developers, everyone will be better off if Node.js features are enhanced as we wish for: businesses will save time and budget for other project developments, customers will have a better experience with the application.

node.js feature, programming language

1. Node.js can connect directly to the database

At present, with the current developing state of Node.js features, it takes a longer time in the data process. Using a node/express application, instead of connecting instantly, you need to make calls to the database to continue the process. Sometimes it basically takes more than one occasion, even more than one module.
On the contrary, other platforms like JavaScript and Ajax allow developers to accelerate the speed of the data process by the offered capacity of the database connection. That’s the thing Node.js developers had better take note to improve their efficiency soon.

2. There is nothing called “callback hell” anymore

One of the most heating debates about the ineffectiveness of Node.js programming is the so-called term among developers “callback hell”.
JavaScript is asynchronous by nature, therefore the cross-platform environment executing JavaScript code – Node.js, relies labouriously on callbacks. A callback is a function that runs each time one task in the queue is completed. It is not the problem here, but the consequence of this step is really annoying. After keeping a number of queued tasks along with each callback of ones, the bad result is to directly impact the quality of code. To be clear, it’s a “situation where callbacks are nested within other callbacks several levels deep, possibly making it hard to understand and maintain the code.”
Yet, if you have a long-time experience with JavaScript and Node.js, you will not have a hard time to figure out how to solve this issue. Codes can be reconstructed and simplified with a few steps. But it’s still more convenient that you don’t need to think twice to simplify the codes in the beginning, right?

3. Performance bottlenecks with heavy computation can be resolved

Another disadvantage of Node.js features that developer community don’t like at all is its deficiency in heavy computations. Node.js is still a single-threaded environment, which people don’t consider as the most advanced technology at present. Some drawbacks reveal like the case a CPU-bound task (number crunching, various calculations) can block the event loop, coming up with few seconds of delay for all Node.js website users.

Depending on the consequence, the negative effects following after can damage the sufficiency of the business, more explicitly in the below example, user experience. In order to avoid these not-so-good outcomes, no one seems to recommend to apply Node.js programming to computation-heavy systems.

4. Node.js Tooling can reach to its maturity soon

Though the core Node.js modules are in its great stability, several tools in the npm registry (the registry of Node.js package manager) is in the state of poor quality or not precisely documented/ tested. Furthermore, the structure of the registry isn’t decent and convenient enough to suggest us the tools based on their ratings and quality. So, it seems to be not easy to find out the best solution suited to your purposes when the platform itself hasn’t been totally optimized for what we are looking for.
One of the greatest features of Node.js: open-source ecosystem, also reveals its deficit. In contrast with the fact that the quality of the core Node.js technology is supervised and justified by Joyent and other major contributors, the rest of the tools í out of this necessary supervision, therefore lack the quality and high coding standards set by global organizations.

5. Node.js Real-time with Socket.IO (WebSocket protocol)

First, let’s get a clear definition of Real-time with an attached example. With the assistance of WebSocket, real-time is a totally possible option to connect a client to a server. Once 2 sides have been connected, the client is able to receive the data without continuously refreshing the website. Otherwise, the server will also be able to receive data in real time from the client in the same connection.
Socket.IO is one of the most well-known real-time engines for Node.js. It’s great to implement this cutting-edge technology into your Node.js applications, right?
Socket.IO supports you in many tasks as the means of Node.js events: you can fire up a function when a new user connects to the server, listen for a connection event and emit a message over a socket and so on.
With its great advantages and functional benefits, a myriad of companies and developers chooses Socket.IO. Besides real-time analytics and monitoring, Socket.IO is the ideal tools for Instant messaging applications, streaming, document collaboration and many more.
To understand thoroughly how Node.js along with MySQL, MongoDB, Angular, PHP 7, Laravel 5 can elevate your business with the real-time application, let’s take a few seconds to know Helo Livestream Mobile Application. It is the first-ever live media streaming application that facilitates us to showcase our gifted abilities by getting noticed by our respective industries.
Savvycom’s engineering team apply the ultra-low latency live streaming video using RTMP. This application helps Helo Livestreaming Mobile Application to serve 300,000 users simultaneously, all data needed to be shown in real-time across a wide geographical area.

6. Node.js features: Supporting Community will expand more in the future

One sentence to sum up how great the Node.js Community is: “Not only the developers who contribute to Node.js make this platform so great, but those who create learning materials around it were also exceptional.”
Here are the credential proofs to justify the below statement

Amazing useful community-curated lists

If you start stepping into Node.js field and want to gain useful knowledge as soon as possible, you can join Node.js Community to ask for helpful pieces of advice. There are so many articles containing practices and shortcuts that you can definitely enhance your skills by going through them.
There are many other great advantages I can list out such as:

  • Available insightful Case Studies
  • Well-covered Node.js Authentication & Security
  • API development with Node.js has been made even easier
  • Awesome new tools
  • Amazing Free Crash Courses
  • The community can attend great conferences, like Node Interactive!
For further information about Node.js services, feel free to contact Savvycom to book a meeting.
We’re happy to discuss with you to find out the right Node.js web developer for your project or lend you our professional and expert developers.


Node.js in Web Development – Key benefits

Thanks to Node.js Development Service, websites now can be scalable network applications that work properly with various operation systems threads. With the chance to open up the vast amount of open source libraries of technology, Node.js is no doubt to be one of the best choices at present.

node js web development, node js benefits

And this choice was affirmed by Walmart, Intel, NASA, IBM, Paypal, LinkedIn, and many more big cooperations. Being curious about the reason why Node.js is so appealing? Let’s take a further step into the world of Node.js in web development.

Why Node.js Web Development is faster than others?

Non-blocking Input/Output operation (I/O operation) is the main reason that makes people say: “Node.js in web development is faster than others’. In other words, Node.js runs on callback-based asynchronous IO: requests can be automatically queued and served by a thread; once the first request has been finished, it gives call back to the thread and the next request is ready to be in the process. Therefore, the time between requests is optimization saved, in contrast to the Apache server, when there is waiting time between.
Related post:

It is more noteworthy that Node.js is an excellent platform for the data-intensive real-time application that runs across distributed devices. It is also specifically designed for writing scalable Internet applications, prominently in developing web servers. Its remarkable performance is proved based on the architecture of many Internet applications.

Other outstanding features of Node.js Web Development

  • Scalability

Node.js assists IT programming developers to scale the application in both horizontal and vertical ways. Hence, the performance of the application is improved; crashes and other risk issues is significantly mitigated.

  • Testing now is easier with Node.js

With the assistance of Node.js in web development, unit testing is not a big obstacle anymore. Getting access to the vast amount of good testing libraries of Node.js, developers now can spend less time in this task to have more time to do other important tasks.

  • Node.js is one of the most extensive package ecosystem ever!

At the end of 2016, there are about 400,000 packages and steadily go way higher up to this day. Is this statistics impressive enough for you?
And it gets updated every day! Npm (Node.js package manager), considered to be the world’s largest Software Registry. According to ‘State of the Union: npm’ published in January 2017, “4,685 packages were published in the registry” in a week. It seems to be “never be outdated” with Node.js ecosystem, right?
In 2018 Node.js User Survey Report by Node.js Foundation, Node.js is the most popular package manager, which takes up to 60% of the overall package manager usage.

  • Network application development

With its built-in Application Programming Interface (API), apparently, Node.js Development Company can easily be able to develop different sorts of a web server, chat server and other network application such as DNS Server, Jigsaw servers, TCP servers, HTTPS Server, etc.
Or with your diligence and persistence, you can build a simple web server with Node.js in your own way. There are many detailed instructions and steps out there on the Internet, also in the book “Get programming with Node.js”.
Or you can contact Savvycom to book a FREE consultation about building network application development.

Key benefits that Node.js Web Development offers us

There are some things you might know: JavaScript is an IT programming language running in web browsers. Node.js is the running environment for JavaScript which holds a variety of libraries. And the V8 JavaScript engine is the one executing JavaScript codes.
Now, let’s come back to the benefits. What are these things?

  • Lightweight and scalable

Thanks to V8 JavaScript engine, Node.js Web Development process is more efficient along with its assurance about quality and security. As I mentioned before, non-blocking I/O operation of Node.js application is the main factor that makes ‘lightweight and scalable’ to be the character of your application.

  • Microservices are perfect for Node.js Web Development projects!

Clients tend to choose Node.js for their microservices over others, to optimise the performance of an application. With the support of Node.js platform, you are able to process your application while still using it, scale the parts that are not available yet in your application. Moreover, some unproductive modules can be cancelled at the same time you do below things. This kind of separation of many tasks is the “easily done” factor in microservices operation on a Node.js application.
Mentioned by Stephen Commisso (Senior Software Engineer of GoDaddy) in Node Summit 2015, by rightly utilizing microservices and Node.js, it’s totally capable of handling the same load with only 10% of the hardware.

  • Shorter Time to market

Compared to Java Development Companies, Node.js counterparts are able to meet your requests and give you a full server or application in a shorter time. Node.js’s advantages over other platforms I can list is the modular structure, few lines of codes, agile development and collaborative development approach of Node.js framework.

  • The more striking performance capability of Node.js Web Development

The node.js application can work flawlessly in the fast pace due to Non-blocking event-driven I/O. More detailed, Node.js Development Services optimize the data by reducing its occupied storage space, therefore its speed is boosted 20 times faster!
In the case of Paypal experiment, compared to the previous version of the Java-based application, Node.js Mobile application development manages to cut the response time by 35%. That’s the reason why Node.js Web Development is more preferred to create the high-performance application.
Currently, Node.js framework has passed by many functional characteristics of Java and .Net platform in the field of business app development.

  • Node.js Web Development is constantly innovated

Improvement and improvisation in Node.js Web Development are always taken into consideration. That’s why they have a good intention to find their way to launch new releases and enhances the standards of its codes and features. With ES6 Spec for JavaScript and the support of an open source community, Node.js technology will develop more and become more innovative in the future.
And if you are still wondering how the development focus of Node.js Web Development has changed, let’s look into the statistics of 2018 Node.js User Survey Report by Node.js Foundation

Savvycom is working towards Node.js Development Services

Followed closely by Savvycom, the latest Node.js technologies in our software development keep staying up to date. That’s the reason why our customers, who order Node.js Development Services, are satisfied with our services. ‘REALM – GPS Smart Tracker’ and ‘Shopping App – Sale & Reward System’ are the 2 proud services that we have offered
Realm – GPS Smart Tracker is integrated with Google Maps, SDK, QRCode, Javascript SDK, Node.js and other technologies. Its main services are to allow users to connect and send notifications to other group members simultaneously while verifying the location of team members on a virtual map using GPS technology.
Another one is Shopping App – Sale & Reward System. The application is the solution assisting shop owners to distribute Offers and Gift Cards to users who have installed Reward application on their mobile devices. Finding and picking Gift Cards, inviting friends, co-workers to use Reward application and get Reward are the core functions Savvycom built for the app.

For further enquiries related to Node.js development solution, please do not hesitate to contact Savvycom at:

We would love to give you a free consultation and suggestions to achieve your goals.

When and Why should we use Node.js technology in software development?

Nowadays, JavaScript is the most popular programming language and one of the foremost widespread software development technologies. With its popularity, it has dramatically changed the face of web development. A few years ago, it was magical what we could do with JavaScript, for instance easily running in the browser as well as on the server. If there is a web application project in mind, developers might think about building stack around JavaScript and other tools. After that, they will surely come across Node.js technology for the back-end development platform. Node.js is a tool that fueled the buzz around the use of JavaScript for server-side programming.

node.js technology for software development reasons

What is Node.js?

Node.js is a JavaScript runtime built on Chrome’s V8 JavaScript engine for easily building fast and scalable network applications. Due to its event-driven and non-blocking, I/O model makes it very efficient and lightweight. Node.js is a cross-platform runtime environment for developing server-side and can work within the Node.js runtime on OS X, Linux and Microsoft Windows. Moreover, it opens new opportunities for developers because it uses JavaScript on the front-end and back-end. For the last few years, Node.js technology became a trend and provides lots of off-the-shelf solutions. Additionally, it was used for variety mid-sized projects, however, a few years ago its capabilities took a major leap forward. As a consequence, Node.js takes advantage of a good ratio between product performance, developer effort and exceptional scalabilities. Overall, Node.js technology has become the most favoured JS framework for almost all web developers.

How is Node.js technology different from web JavaScript?

In terms of language, there is no difference between web Node.js technology and JavaScript technology. To be specific, Node.js has a different set of APIs. In browsers, you have a variety of Web APIs uncovered that assist users to connect with UI. Also, it offers some supports such as file systems or HTTP request, however, they are limited due to security concerns. Meanwhile, Node.js assists with different APIs suitable for back-end development.

What is Node.js technology used for?

realtime application using nodejs

To achieve the best application performance in web development, Node.js is used for real-time applications, collaborative tools and data streaming applications. Firstly, Node.js ensures great speed and performance. Also, it can support intense traffic of multiple short messages, or chatrooms when messages are displayed to many users at the same time. Secondly, the ability to process real-time flows are extremely good. Trello is a project management application that is rather popular with software development companies. This application was developed on the basis of Node.js and benefited from its event-driven, non-blocking model. Node.js is great for applications requiring immediate updates, such as various collaboration tools and online documentation suites. Lastly, Node.js is great for data streaming applications. It is critical for audio and video streaming applications. Netflix is an example of how Node.js is powerful in this environment. NodeJS can send large amounts of data in smaller packages instead of a single batch.

Why is it worth developing your project in Node.js?

node js benefits

First of all, using Node.js as your server technology gives your team a great boost that comes from using the same language on both the front-end and back-end. This means that your team is more efficient and cross-functional, which in turn leads to lower development costs. In addition to that, it is worth mentioning that JavaScript is the most popular programming language, so your application’s codebase will be easier to understand for more developers. You can also reuse and share the code between the front-end and back-end parts of your application, which speeds up the development process. On top of that, the Node.js community is constantly growing – the number of StackOverflow questions is steadily increasing, so the knowledge base for the technology is widely available. The fact that the whole Node.js technology stack is open-source and free is also great news. Finally, Node.js offers a great package manager, NPM and the amount of available open-source tools in NPM’s registry is massive and growing fast. These are just a few of the many advantages of Node.js that you should consider when choosing the technology for your next project.

Where Node.js technology can be used?

node js in web app development

Node.js can be used as a server-side web application. Node.js with ExpressJS can also be used to create classic web applications on the server-side. However, while possible, this request-response paradigm in which Node.js technology would be carrying around rendered HTML as not the most typical use-case. There are arguments to be made for and against this approach.

  • Pros:

If your application doesn’t have any CPU intensive computation, you can build it in Javascript top-to-bottom, even down to the database level if you use JSON storage Object DB like MongoDB. This eases development (including hiring) significantly.

Crawlers receive a fully-rendered HTML response, which is far more SEO-friendly than, say, a Single Page Application or a WebSocket app run on top of Node.js.

  • Cons:

Any CPU intensive computation will block Node.js responsiveness, so a threaded platform is a better approach. Alternatively, you could try scaling out the computation.

Using Node.js with a relational database is still quite a pain. Do yourself a favour and pick up any other environment like Rails, Django, or ASP.Net MVC if you’re trying to perform relational operations.


Overall, Node.js development services can be involved in any business sphere with a couple of exceptions mentioned above. Over the last few years, it rapidly advanced from a specific solution for runtime communications to a full-fledged back-end technology with a number of powerful high-level frameworks (e.g. Express, Koa, Next or Nuxt). This evolution made it even more attractive for businesses and any Node.js development company there is; software developers speak highly of it. And if you would like to know what companies are using Node.js in production, the list will be impressive, including such giants as PayPal, Netflix, Uber, LinkedIn, eBay, Walmart, Medium, NASA, Mozilla, and Trello.

Savvycom uses Node.js technology to touch the techniques of the future

At Savvycom, we use Node.js to stay updated with the latest technologies. Also, by using Node.js we can satisfy our great customers. There are some applications that we have developed applying Node.js technology such as Milky Chat and Shopping App.

milky chat, an app using nodejs by savvycom

Have you ever thought what your child is doing at kindergarten? Milky Chat is a communication platform for parents to connect with kindergarten teachers to get the latest images and information about their kids. Teachers use the mobile app to take photos, add notes and information about the kids in their classes such as how many diapers/clothes changed or how much water/milk drunk. Once there are new activities of the kids, their parents got notified on the mobile so that they can open the app to view and interact.

node.js app for shopping, made by savvycom

Another application that we have designed and developed is Shopping App – Sale & Reward System. This application helps shop owners to distribute Offers and Gift Cards to users who have installed Reward application on their mobile devices. Users can find and pick Gift Cards similar to the way they play the Pokemon Go game. Users can invite their friends, co-workers to use Reward application and get Reward.

Book a free consultation now

For further enquiries related to Node.js development solution, please do not hesitate to contact Savvycom at:

Head Office: 12th floor, Viet A Tower, Duy Tan Street, Hanoi, Vietnam

We would love to give you a free consultation and suggestions to achieve your goals.

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