Finding the Right Fit: Comparing 6 Popular Node.js Web Frameworks

Contents

Overview
Express
Koa
hapi
restify
Loopback
Fastify
Conclusion
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Overview

With +62,000 stars on GitHub and more than a billion downloads since its introduction 10 years ago, Node.js is a major open source software project.

Node.js’s popularity can be attributed to its ease of adoption with JavaScript developers, a lightweight and performant core, and suitability for applications across platforms. This rapport with developers has created a thriving community of contributors, and an ecosystem of modules and frameworks to better facilitate secure, performant, and scalable development.

In this guide, we will look specifically at six Node.js web frameworks:

Express
Koa
hapi
restify
Loopback
Fastify

The following factors will be considered when looking at each web framework:

Popularity and community involvement
How easy is it to get started? Installation and basic ‘Hello World’ examples
Performance
Security
A summary of advantages and disadvantages

All the code in this article can be found here and there.

Express

The ‘E’ in ‘MEAN Stack’, Express is a minimal and flexible Node.js web framework that provides a robust set of features for both web and mobile applications, focused on routing, writing middleware, and API development. Express is a clear winner in the downloads category, with over 8 million weekly downloads (second most is 300,000 weekly downloads).

Popularity and Community Involvement

GitHub Stars: 44,000+

npm weekly downloads: 8,000,000+

Number of contributors: 233

Closed Pull Requests: 844

The Express community meets regularly, and they communicate through their mailing list, Gitter, IRC channel, issues in GitHub, and the Express Wiki.

Installation

To install Express, navigate to your project’s root directory and run:

   $ npm install express

Note: use the --no-save flag if you would like to use a package but not save it to your dependencies

express-generator is a package that will give you a basic Express project structure, and is great for getting started quickly.

Hello World app

Here is a basic Express app that listens on port 3000 and displays ‘Hello World!’ in the browser. For more detailed instructions, see the Express Installation guide.

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

Open http://localhost:3000/ in your browser to see the output and inspect the application.

To see more complex Express applications in action, here is a list of popular frameworks that are built on Express.

Performance

Express provides a thin layer of fundamental, un-opinionated web application features over Node.js, meant to provide some convenience with minimal hit on performance.

While comparing the benchmarking of these various frameworks, keep in mind that production demands are unique to each application, and when making performance decisions it is critical to establish baseline performance ranges based on an application’s specific demands.

All of this guide’s benchmarking information was captured with ab, the CLI for Apache Bench.

Over 5 tests the simple Express server averaged 6,301 requests per second.

Here are some application performance best practices from the folks at Express:

Use gzip compression
Don’t use synchronous functions
Handle 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.

Security

Express publishes regular security updates. Since Node.js vulnerabilities directly affect Express, it is important to keep an eye on Node.js updates, and always check that you are using the latest stable version of Node.js.

Advantages

Open source
Express is the standard; plenty of community support and documentation
Simple, minimalistic, flexible, and scalable
Fast app development
Fully customizable
Low learning curve
Easy integration of third-party services and middleware
Ideal for smaller projects

Disadvantages

Although Express is a very convenient and easy-to-use framework, it has some minor drawbacks that may influence the development process.

“Callback hell”
Lack of opinionated architecture means organization needs to be very clear to avoid problems maintaining the code
As your codebase size increases, refactoring becomes very challenging
A lot of manual labor is required, since you need to create all endpoints

Koa

Koa was built by the same team behind Express, and aims to be more of a direct improvement on Node.js, rather than an augmentation of Node.js (like Express), creating a smaller, more expressive, and more robust foundation for web applications and APIs. By leveraging async functions, Koa frees developers from callback hell, and significantly improves error-handling. Koa does not bundle any middleware within its core, and it while providing a helpful suite of methods.

Popularity and Community Involvement

GitHub Stars: 26,000+

npm weekly downloads: 300K+

Number of contributors: 175

Closed Pull Requests: 589

You can join G+ koa Community, mailing list, contribute to Koa’s repo, join koa slack, or start a discussion in hashnode.

Installation

To install, navigate to your project’s root directory and run:

  $ npm install koa

Note: Koa requires Node.js v7.6.0 or higher for ES2015 and async function support.

Hello World app

Here is a basic Koa app that listens on port 3000 and displays ‘Hello World!’ on the browser. For more detailed instructions, see the Koa application guide.

  const Koa = require('koa');
  const app = new Koa();
  app.use(async ctx =>
  {
      ctx.body = 'Hello World!';
  });
  app.listen(3000);

A Koa Context (ctx in the code block above) is an abstraction that wraps around node’s request and response objects to facilitate development and control.

Note: ctx.req and ctx.res are node request and response objects, respectively, whereas ctx.request and ctx.response are Koa request and response objects, respectively.

Performance

Koa is free of any middleware, routing, or common convenience features like sending files, keeping its core extra light and performant.

Over 5 tests the simple Koa server averaged 8,706 requests/second.

Security

Koa relies on external middleware to maintain secure applications. Some popular security middleware for Koa are koa-helmet, koa-ip-filter, and koa-authz.

As always, it is important to keep an eye on Node.js updates, and always check that you are using the latest stable version of Node.js.

Advantages

Koa improves interoperability, robustness, and makes writing middleware much more enjoyable.

Open source
Maintains a small footprint, as no middleware are bundled, just 550 lines of code
Smooth user experience
Promises-based control flow
Better error handling through try/catch
Cleaner, more readable async code

Disadvantages

The open source community around Koa is relatively small
Not compatible with conventional Express middleware
Writing common middleware from scratch

hapi

hapi is a rich, configuration-driven framework for building applications and services, with an emphasis on addressing concerns for big projects and teams. It enables developers to focus on writing reusable application logic instead of spending time building infrastructure.

Popularity and Community Involvement

GitHub Stars:11,000+

npm weekly downloads: 250K+

Number of contributors: 184

Closed Pull Requests: 1,182

You can join slack channel, visit the community page, community governance page and follow them on twitter to keep updated with the latest news.

Installation

To install, navigate to your project’s root directory and run:

  $ npm install hapi

Hello World app

Here is a basic hapi app that listens on port 3000 and displays ‘Hello World!’.

  'use strict';
  const Hapi = require('@hapi/hapi');
  // Create a server with a host and port
  const server = Hapi.server({
      host: '127.0.0.1',
      port: 3000
  });
  // Add the route
  server.route({
      method: 'GET',
      path: '/',
      handler: function(request, h) {
          return 'Hello World!';
      }
  });
  // Start the server
  const start = async function() {
      try {
          await server.start();
      } catch (err) {
          console.log(err);
          process.exit(1);
      }
      console.log('Server running at:', server.info.uri);
  };
  start();

Add the code snippet above to your project’s point of entry (I used ‘index.js’), and run node index.js to start the server. Navigate to ‘localhost:3000/’ to check for ‘Hello World!’ in the browser.

Performance

To sum hapi’s performance up neatly, here is what Joel Chen from WalmartLabs, where hapi was developed, had to say in an article about optimizing hapiJS:

“Hapi is a framework focus[sic] on providing an infrastructure for developing solid business applications. It makes tradeoffs on “benchmark performances” for features such as strict checks and validations that are very useful when hundreds of developers are working on the apps.”

Here is a humorous and well-informed perspective on benchmarking from Eran Hammer, the creator of hapi.js.

Over 5 tests the simple Hapi server averaged 3,703 requests/second.

Security

Different hapi-specific plugins can help to improve hapi security, here are a few from a more detailed article by Synopsys:

Crumb: Anti cross-site-request-forgery (XCSRF) token generation and validation plugin.
Joi: Object schema description language and validator for JavaScript objects.
Hapi-rbac: Allows developers to implement role-based access controls easily.
Blankie: Allows developers to set the Content-Security-Policy header directives easily and discriminately.
Cryptiles: Provides general purpose cryptographic utilities for random number generation, encryption, hashing and fixed-time comparisons of hashes that are based on the Node.js crypto library.

Advantages

Open source
Build scalable APIs quickly
Richer out-of-the-box request handling
An extensive plugin system
Good documentation coverage
Suitable for large projects

Disadvantages

Higher learning curve for those experienced with Express
Developers need to figure out the code structure on their own.
“Locks” developers into using hapi-specific modules and plugins
Endpoints are created manually and must be tested manually
Refactoring is manual

restify

According to their README, restify is a Node.js framework that uses connect-style middleware for building RESTful APIs.

Trusted by big tech brands like npm, Netflix, and Joyent, restify has been in the ecosystem since 2011, and, compared to Express, offers better controls over lower-level concerns such as latency and other performance issues.

Popularity and Community Involvement

GitHub Stars: 9,000+

npm weekly downloads: 99,000+

Number of contributors:188

Closed Pull Requests: 752

You can reach out about issues or bugs on GitHub, join their mailing list, and follow them on twitter to keep updated with the latest news.

Installation

To install, navigate to your project’s root directory and run:

  $ npm install restify

Hello World app

Here is a basic restify app that listens on port 3000 and displays ‘Hello World!’.

  var restify = require('restify');
  var server = restify.createServer();
  function respond(req, res, next) {
    res.send('Hello World!');
    next();
  }
  server.get('/', respond);
  server.head('/', respond);
  server.listen(3000, function() {
    console.log('You are listening at %s', server.url);
  });

Performance

In this article’s simple benchmarking context, restify performs the best of the six frameworks, with an average of over 9,000 requests/s. This is significant as it has more out-of-the-box functionality than Express, yet maintains a performance edge.

Over 5 tests the simple restify server averaged 9,573 requests/second.

Security

Restify has no known security issues. A well-populated middleware community provides solutions to standard security concerns like authentication and CORS.

Advantages

Open source
Easy to pick up for Express developers
A lot of functionality for a small footprint
A performant, scalable framework capable of handling high request loads

Disadvantages

Manual endpoint creation and testing
Lacks a clear structure
Can become difficult to maintain

Loopback

Based on Express, Loopback is a Node.js framework for building APIs that focuses on “convention over configuration,” and providing developers some of the out-of-the-box ‘magic’ more commonly associated with frameworks like Ruby on Rails.

Written in TypeScript/ES2017, Loopback ensures concurrency with the latest features, such as async and decorators. Loopback is maintained by IBM’s StrongLoop, who are core supporters of Node.js and Express, giving it a huge network of experience, and an eye on convenience for large scale development projects.

Popularity and Community Involvement

GitHub Stars: 12,000+

npm weekly downloads: 28,000+

Number of contributors: 103

Closed Pull Requests: 1,026

For questions and general information, you can head over to Loopback’s Developer Resources, including their blog, tutorials, and other helpful links. You can use StrongLoop’s twitter to reach out about #loopback. Join the conversation on Gitter or their Google Group.

Installation

Install the Loopback 4 CLI globally. You might have to prefix with sudo to grant permission:

  npm install -g @loopback/cli

Hello World app

Once the LoopBack 4 CLI has installed, we have to create a new application project. We will call this application ‘app’:

  $ lb4 app

You will be prompted with some questions to pre-configure the project. Answer the prompts as follow:

Once complete, change directories and start up the server:

  $ cd getting-started
  $ npm start

Check the server by visiting http://127.0.0.1:3000/ping in your browser.

Note: It’s worth pointing out that we now have two functional routes, ‘/’ and ‘/ping’, and we haven’t written any code! Features like this speed up development, sometimes at the cost of flexibility and performance.

To give us a ‘Hello World!’ display we will have to add a new controller:

  $ lb4 controller

More prompts will follow. Enter ‘hello’ for the class name prompt. For the second prompt, choose to make an ‘Empty Controller.’

Note: For the second prompt, you can also choose ‘REST Controller with CRUD functions,’ but you will be required to set up additional resources that this guide will not go in to (though LoopBack’s tutorials do).

You can paste the following code block into the newly created /src/controllers/hello.controller.ts:

  import { get } from '@loopback/rest';
  export class HelloController {
	  @get('/hello')
	  hello(): string {
		  return 'Hello world!';
	  }
  }

Visit http://127.0.0.1:3000/hello to see ‘Hello world!’

Performance

Loopback performed relatively well in the benchmarking tests.

Over 5 tests the simple Loopback server averaged 9,074 requests/second.

Security

Staying up to date with the Node.js releases and the latest version of LoopBack is foundational to a secure application. To update LoopBack you run the installation command npm install -g @loopback/cli.

LoopBack’s very good documentation provides a lot of clear and helpful information for handling security issues like authentication and authorization.

Advantages

Open source
Fully-featured, with lots of out-of-the-box functionality and “magic”
Use of TypeScript enables easier automation of validations and testing
Opinionated architecture is helpful for larger development teams
Documentation is clear and thorough, including detailed How-To material
Full-time team of support staff and engineers
Built-in models, ORM/ODM support, and access-level controls
Speedy database connection across a range of database providers

Disadvantages

Potentially steep learning curve for developers
Comes with a lot of files
Opinionated architecture can feel like bloat at first

Fastify

Per the Fastify website, “Fastify is a web framework highly focused on providing the best developer experience with the least overhead and a powerful plugin architecture. It is inspired by Hapi and Express and as far as we know, it is one of the fastest web frameworks in town.”

Introduced in 2017, Fastify is a newer player in the Node.js framework community, and is optimized for HTTP APIs that handle JSON data.

Popularity and Community Involvement

GitHub Stars: 11,000+

npm weekly downloads: 39,000+

Number of contributors: 166

Closed Pull Requests: :1,034

You can reach out about issues or bugs on GitHub or their help page, join the conversation on Gitter, and follow them on twitter to keep updated with the latest news.

Installation

To install, navigate to your project’s root directory and run:

  $ npm install fastify

Hello World app

Now we will make a simple Fastify app that listens on port 3000 and displays a JSON object, { Hello: “World!” }. This code sample will make use of async-await.

  const fastify = require('fastify')
  fastify.get('/', async (request, reply) =>
  {
	  return {
		  hello: 'world'
	  }
  })
  const start = async () =>
  {
	  try {
		  await fastify.listen(3000)
		  fastify.log.info(`server listening on ${fastify.server.ad-
      dress().port}`)
	  } catch (err) {
		  fastify.log.error(err)
		  process.exit(1)
	  }
  }
  start()

Note: Fastify has a generator function with its CLI if you want to get up and running with a bit more to explore.

Performance

If you look at their benchmarking numbers, Fastify is actually the fastest Node.js framework.

Fastify’s benchmarking repo is a great resource for curious Node.js developers looking to compare frameworks’ code, quality, and general feel.

Here is how Fastify did under our benchmarking conditions:

Over 5 tests the simple Fastify server averaged 8,854 requests/second.

Security

Taking a lead from hapi.js, Fastify has a rich plugin ecosystem of core and community plugins. Core plugins such as fastify-auth, fastify-cors, fastify-jwt, and fastify-helmet provide most of the needed security and validation. The core support for these features also seems to be sufficient as the community plugins don’t cover this terrain as much.

Advantages

Open source

Highly extensible

CLI with a generator tool makes spinning up applications efficient

Developer friendly

Disadvantages

Small team of maintainers

Small community of developers

Not beginner friendly. A robust understanding of Node.js and HTTP is required

Can be difficult to debug

Conclusion

This review has no intention of deciding on “one framework to rule them all”, but rather highlighting the use and general characteristics of six of the most common and compelling Node.js web frameworks to make finding the software that best aligns with your application needs. With that said, let’s look at each of the criteria with all six frameworks in mind. As a reminder, the criteria were:

Popularity and community involvement

How easy is it to get started? Installation and basic ‘Hello World’ examples

Performance

Security

A summary of advantages and disadvantages

In the Popularity and Community Involvement category, the clear winner is Express.js. With over 7,000,000 more weekly downloads than the nearest competitor, it truly stands alone as the standard abstraction of Node.js’s http module. This means there is an abundance of both core and community documentation, troubleshooting support, video tutorials, and other resources for Express-based applications.

Koa, hapi, Restify, all fall between 100,000 and 300,000 weekly downloads, with enthusiastic communities of developers.

Fastify and Loopback have a lot less engagement, and this was reflected in the auxiliary resources we were able to find online. That being said, both have good core documentation.

When it came to Getting Started, five out of the six were fairly straightforward: install the dependency, create a server file, run with node. Loopback, however, required several more steps, and locks you into its opinionated manners almost immediately. This felt burdensome for a simple example, but if our example had been creating a whole suite of RESTful routes, it would have stood out as the fastest and easiest, as Loopback has baked in a lot more ‘automagic’ than any of the other frameworks.

We compared the Performance of the six frameworks with Apache Bench, a CLI tool for simple load testing. hapi.js was the ‘slowest’, averaging about 3700 requests/second, while Koa, restify, Loopback, and Fastify averaging between 8700 and 9500 requests/second. Express.js landed somewhere in the middle with about 6,300 requests/second. At the risk of sounding redundant, production demands are unique to each application, and when making performance decisions it is critical to establish baseline performance ranges based on an application’s specific demands.

There were no isolated or unique Security concerns among the six frameworks. As all six ‘sit’ on top of Node.js, it is important to keep an eye on Node.js updates, and always check that you are using the latest stable version of Node.js. Aside from that, making sure to keep dependencies up to date, using the right plugins, and staying focused on fundamental security concerns like headers will help keep your applications secure with any of these frameworks.

To summarize the Advantages and Disadvantages, let’s focus on what each framework seems best at accomplishing (with associated downside):

Framework	Big Pro	Big Con
Express	Simple, fully customizable, low learning curve	Constantly re-inventing the wheel
Koa	Even lighter than Express	Not compatible with Express middleware
hapi	Great out-of-the-box functionality	Potentially high learning curve
restify	Lots of functionality with a small footprint	Manual endpoint creation and testing
Loopback	Generate RESTful APIs in a flash	A lot of code you might not need
Fastify	Highly extensible and performant	Small team of maintainers

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