express – expressjs

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

Table of contents

• Installation
• Features
• Docs & Community
• Quick Start
• Philosophy
• Examples
• Contributing
• Security Issues
• Running Tests
• Current project team members
• TC (Technical Committee)
• TC emeriti members
• Triagers
• Emeritus Triagers
• License

[![NPM Version][npm-version-image]][npm-url]
[![NPM Downloads][npm-downloads-image]][npm-downloads-url]
[![Linux Build][github-actions-ci-image]][github-actions-ci-url]
[![Test Coverage][coveralls-image]][coveralls-url]
[![OpenSSF Scorecard Badge][ossf-scorecard-badge]][ossf-scorecard-visualizer]

import express from 'express'

const app = express()

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

app.listen(3000, () => {
  console.log('Server is running on http://localhost: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 <code class="ra0-md-code">npm init</code> command.

Installation is done using the
<code class="ra0-md-code">npm install</code> 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

• Website and Documentation - [website repo]
• GitHub Organization for Official Middleware & Modules
• Github Discussions for discussion on the development and usage of Express

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 <code class="ra0-md-code">express(1)</code> 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

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.

This project has a [Code of Conduct]. By participating, you are expected to uphold this code.

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

Current project team members

For information about the governance of the express.js project, see GOVERNANCE.md.

The original author of Express is TJ Holowaychuk

List of all contributors

TC (Technical Committee)

• UlisesGascon - Ulises Gascón* (he/him)
• jonchurch - Jon Church*
• wesleytodd - Wes Todd*
• LinusU - Linus Unnebäck*
• blakeembrey - Blake Embrey*
• sheplu - Jean Burellier*
• crandmck - Rand McKinney*
• ctcpip - Chris de Almeida*

<details>
<summary>TC emeriti members</summary>

TC emeriti members

• dougwilson - Douglas Wilson*
• hacksparrow - Hage Yaapa*
• jonathanong - jongleberry*
• niftylettuce - niftylettuce*
• troygoode - Troy Goode*

</details>

Triagers

• aravindvnair99 - Aravind Nair*
• bjohansebas - Sebastian Beltran*
• carpasse - Carlos Serrano*
• CBID2 - Christine Belzie*
• UlisesGascon - Ulises Gascón* (he/him)
• IamLizu - S M Mahmudul Hasan* (he/him)
• Phillip9587 - Phillip Barta*
• efekrskl - Efe Karasakal*
• rxmarbles - Rick Markins* (he/him)
• krzysdz
• GroophyLifefor - Murat Kirazkaya*

<details>
<summary>Triagers emeriti members</summary>

Emeritus Triagers

• AuggieH - Auggie Hudak*
• G-Rath - Gareth Jones*
• MohammadXroid - Mohammad Ayashi*
• NawafSwe - Nawaf Alsharqi*
• NotMoni - Moni*
• VigneshMurugan - Vignesh Murugan*
• davidmashe - David Ashe*
• digitaIfabric - David*
• e-l-i-s-e - Elise Bonner*
• fed135 - Frederic Charette*
• firmanJS - Firman Abdul Hakim*
• getspooky - Yasser Ameur*
• ghinks - Glenn*
• ghousemohamed - Ghouse Mohamed*
• gireeshpunathil - Gireesh Punathil*
• jake32321 - Jake Reed*
• jonchurch - Jon Church*
• lekanikotun - Troy Goode*
• marsonya - Lekan Ikotun*
• mastermatt - Matt R. Wilson*
• maxakuru - Max Edell*
• mlrawlings - Michael Rawlings*
• rodion-arr - Rodion Abdurakhimov*
• sheplu - Jean Burellier*
• tarunyadav1 - Tarun yadav*
• tunniclm - Mike Tunnicliffe*
• enyoghasim - David Enyoghasim*
• 0ss - Salah*
• ejcheng- Eric Cheng* (he/him)
• dakshkhetan - Daksh Khetan* (he/him)
• lucasraziel - Lucas Soares Do Rego*
• mertcanaltin - Mert Can Altin*
• dpopp07 - Dustin Popp*
• Sushmeet - Sushmeet Sunger*
• 3imed-jaberi - Imed Jaberi*

</details>

License

MIT

[coveralls-image]: https://img.shields.io/coverallsCoverage/github/expressjs/express?branch=master
[coveralls-url]: https://coveralls.io/r/expressjs/express?branch=master
[github-actions-ci-image]: https://img.shields.io/github/actions/workflow/status/expressjs/express/ci.yml?branch=master&label=ci
[github-actions-ci-url]: https://github.com/expressjs/express/actions/workflows/ci.yml
[npm-downloads-image]: https://img.shields.io/npm/dm/express
[npm-downloads-url]: https://npmcharts.com/compare/express?minimal=true
[npm-url]: https://npmjs.org/package/express
[npm-version-image]: https://img.shields.io/npm/v/express
[ossf-scorecard-badge]: https://api.scorecard.dev/projects/github.com/expressjs/express/badge
[ossf-scorecard-visualizer]: https://ossf.github.io/scorecard-visualizer/#/projects/github.com/expressjs/express
[Code of Conduct]: https://github.com/expressjs/.github/blob/HEAD/CODE_OF_CONDUCT.md
[Contributing Guide]: https://github.com/expressjs/.github/blob/HEAD/CONTRIBUTING.md