express vs koa vs fastify vs @hapi/hapi vs sails
Node.js Web Frameworks Comparison
1 Year
expresskoafastify@hapi/hapisailsSimilar Packages:
What's Node.js Web Frameworks?

Node.js web frameworks are server-side frameworks that provide a robust set of features for building web applications, APIs, and services. They simplify the development process by offering built-in functionalities such as routing, middleware support, and request handling, allowing developers to focus on building their applications rather than dealing with low-level server details. Each framework has its unique characteristics, performance metrics, and design philosophies, catering to different development needs and preferences.

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express37,979,31466,689197 kB1758 days agoMIT
koa3,470,92535,39161.8 kB18a day agoMIT
fastify2,448,05533,3832.57 MB9513 days agoMIT
@hapi/hapi980,31414,684419 kB78a month agoBSD-3-Clause
sails38,70422,8603.26 MB5914 months agoMIT
Feature Comparison: express vs koa vs fastify vs @hapi/hapi vs sails

Performance

  • express:

    Express is lightweight and has minimal overhead, making it fast for handling requests. However, performance can degrade with excessive middleware, so careful management is required.

  • koa:

    Koa is lightweight and unopinionated, allowing developers to build applications with minimal overhead. Its use of async/await helps improve performance by reducing callback hell.

  • fastify:

    Fastify is built for speed, boasting one of the fastest request handling times among Node.js frameworks. It uses a highly optimized schema-based validation system to enhance performance.

  • @hapi/hapi:

    Hapi is designed for high performance, but its extensive features can introduce some overhead compared to lighter frameworks. It is optimized for handling complex applications with many routes and plugins.

  • sails:

    Sails can be slower compared to others due to its MVC architecture and built-in features. However, it is optimized for data-driven applications, making it efficient for those specific use cases.

Middleware Support

  • express:

    Express has a rich ecosystem of middleware, making it easy to add functionalities like logging, authentication, and error handling. Its simplicity allows developers to create custom middleware effortlessly.

  • koa:

    Koa's middleware is built around async functions, allowing for a more modern approach to handling requests. It provides a minimalistic way to compose middleware, promoting cleaner code.

  • fastify:

    Fastify supports middleware but emphasizes the use of plugins for better performance and encapsulation. Its plugin architecture allows for isolated features that can be reused across applications.

  • @hapi/hapi:

    Hapi has a robust plugin system that allows for extensive middleware support. It encourages the use of reusable plugins to extend functionality without cluttering the core application logic.

  • sails:

    Sails integrates middleware seamlessly into its MVC structure, allowing developers to use existing Express middleware. However, it may not be as flexible as other frameworks in this regard.

Learning Curve

  • express:

    Express is known for its simplicity and ease of use, making it beginner-friendly. Developers can quickly grasp the basics and start building applications without much overhead.

  • koa:

    Koa's use of async/await can be a double-edged sword; while it simplifies asynchronous code, developers unfamiliar with these concepts may face a steeper learning curve.

  • fastify:

    Fastify has a straightforward API and is easy to learn, especially for those familiar with Express. Its focus on performance and schema validation may require some additional learning.

  • @hapi/hapi:

    Hapi has a moderate learning curve due to its extensive features and configuration options. Developers may need time to understand its plugin system and best practices.

  • sails:

    Sails has a higher learning curve due to its MVC architecture and conventions. Developers may need to invest time in understanding its structure and how to leverage its features effectively.

Extensibility

  • express:

    Express is also extensible, with a vast ecosystem of middleware and plugins available. Developers can create custom middleware to suit their specific needs, making it adaptable for various applications.

  • koa:

    Koa is designed to be extensible, allowing developers to create custom middleware easily. Its minimalistic approach encourages building only what is necessary for the application.

  • fastify:

    Fastify's plugin architecture promotes extensibility, enabling developers to encapsulate features and share them across projects. This modularity enhances maintainability and reusability.

  • @hapi/hapi:

    Hapi is highly extensible through its plugin system, allowing developers to create reusable components and integrate third-party plugins easily, enhancing application functionality.

  • sails:

    Sails provides extensibility through its built-in features and integration with existing Node.js modules. However, its opinionated structure may limit flexibility compared to more minimalistic frameworks.

Community and Ecosystem

  • express:

    Express has one of the largest communities and ecosystems in the Node.js world. Its extensive documentation and numerous middleware options make it a go-to choice for many developers.

  • koa:

    Koa has a smaller community compared to Express but is supported by a dedicated group of developers. Its ecosystem is growing, with various middleware options available.

  • fastify:

    Fastify's community is rapidly growing, with increasing support and resources. Its focus on performance attracts developers looking for efficient solutions.

  • @hapi/hapi:

    Hapi has a growing community and a solid ecosystem of plugins and tools. While not as large as Express, it is well-supported with documentation and resources.

  • sails:

    Sails has a niche community focused on data-driven applications. While its ecosystem is not as extensive as Express, it provides specific tools and resources for real-time applications.

How to Choose: express vs koa vs fastify vs @hapi/hapi vs sails
  • express:

    Choose Express for its simplicity and minimalism, especially for small to medium-sized applications or APIs. Its vast ecosystem of middleware allows for rapid development and easy integration of various functionalities.

  • koa:

    Choose Koa if you prefer a lightweight and modular approach. Koa uses async/await for cleaner code and is ideal for developers who want to build their middleware and applications from the ground up without the bloat of additional features.

  • fastify:

    Choose Fastify if performance is a top priority. It is designed for speed and low overhead, making it suitable for high-performance applications and APIs, with built-in schema-based validation and serialization.

  • @hapi/hapi:

    Choose Hapi if you need a powerful and flexible framework that emphasizes configuration over convention, with built-in support for input validation, caching, authentication, and more, making it ideal for large-scale applications.

  • sails:

    Choose Sails if you are building data-driven applications and want an MVC framework that provides a convention-over-configuration approach. It is particularly useful for real-time applications and comes with built-in support for WebSockets.

README for express

Express Logo

Fast, unopinionated, minimalist web framework for Node.js.

This project has a Code of Conduct.

Table of contents

NPM Version NPM Downloads OpenSSF Scorecard Badge

import express from 'express'

const app = express()

app.get('/', (req, res) => {
  res.send('Hello World')
})

app.listen(3000)

Installation

This is a Node.js module available through the npm registry.

Before installing, download and install Node.js. Node.js 18 or higher is required.

If this is a brand new project, make sure to create a package.json first with the npm init command.

Installation is done using the npm install command:

npm install express

Follow our installing guide for more information.

Features

  • Robust routing
  • Focus on high performance
  • Super-high test coverage
  • HTTP helpers (redirection, caching, etc)
  • View system supporting 14+ template engines
  • Content negotiation
  • Executable for generating applications quickly

Docs & Community

PROTIP Be sure to read the migration guide to v5

Quick Start

The quickest way to get started with express is to utilize the executable express(1) to generate an application as shown below:

Install the executable. The executable's major version will match Express's:

npm install -g express-generator@4

Create the app:

express /tmp/foo && cd /tmp/foo

Install dependencies:

npm install

Start the server:

npm start

View the website at: http://localhost:3000

Philosophy

The Express philosophy is to provide small, robust tooling for HTTP servers, making it a great solution for single page applications, websites, hybrids, or public HTTP APIs.

Express does not force you to use any specific ORM or template engine. With support for over 14 template engines via @ladjs/consolidate, you can quickly craft your perfect framework.

Examples

To view the examples, clone the Express repository:

git clone https://github.com/expressjs/express.git --depth 1 && cd express

Then install the dependencies:

npm install

Then run whichever example you want:

node examples/content-negotiation

Contributing

Linux Build Test Coverage

The Express.js project welcomes all constructive contributions. Contributions take many forms, from code for bug fixes and enhancements, to additions and fixes to documentation, additional tests, triaging incoming pull requests and issues, and more!

See the Contributing Guide for more technical details on contributing.

Security Issues

If you discover a security vulnerability in Express, please see Security Policies and Procedures.

Running Tests

To run the test suite, first install the dependencies:

npm install

Then run npm test:

npm test

People

The original author of Express is TJ Holowaychuk

List of all contributors

TC (Technical Committee)

TC emeriti members

TC emeriti members

Triagers

Triagers emeriti members

Emeritus Triagers

License

MIT