Express

Fast, unopinionated, minimalist web framework for node.

Node.js framework Express

expressjs/express expressjs.com express

README

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

[![NPM Version][npm-version-image]][npm-url]

[![NPM Install Size][npm-install-size-image]][npm-install-size-url]

[![NPM Downloads][npm-downloads-image]][npm-downloads-url]

```js
const express = require('express')
const app = express()
app.get('/', function (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 0.10 or higher is required.

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

the [npm init command](https://docs.npmjs.com/creating-a-package-json-file).

Installation is done using the

[npm install command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):

```console
$ 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]

#express on Libera Chat IRC

GitHub Organization for Official Middleware & Modules

Visit the Wiki

Google Group for discussion

Gitter for support and discussion

PROTIP Be sure to read Migrating from 3.x to 4.x as well as New features in 4.x.

Quick Start

The quickest way to get started with express is to utilize the executable [express(1)](https://github.com/expressjs/generator) to generate an application as shown below:

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

```console
$ npm install -g express-generator@4
```

Create the app:

```console
$ express /tmp/foo && cd /tmp/foo
```

Install dependencies:

```console
$ npm install
```

Start the server:

```console
$ 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 Consolidate.js,

you can quickly craft your perfect framework.

Examples

To view the examples, clone the Express repo and install the dependencies:

```console
$ git clone git://github.com/expressjs/express.git --depth 1
$ cd express
$ npm install
```

Then run whichever example you want:

```console
$ node examples/content-negotiation
```

Contributing

[![Linux Build][github-actions-ci-image]][github-actions-ci-url]

[![Windows Build][appveyor-image]][appveyor-url]

[![Test Coverage][coveralls-image]][coveralls-url]

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, then run npm test:

```console
$ npm install
$ npm test
```

People

The original author of Express is TJ Holowaychuk

The current lead maintainer is Douglas Christopher Wilson

List of all contributors

License

MIT

[appveyor-image]: https://badgen.net/appveyor/ci/dougwilson/express/master?label=windows

[appveyor-url]: https://ci.appveyor.com/project/dougwilson/express

[coveralls-image]: https://badgen.net/coveralls/c/github/expressjs/express/master

[coveralls-url]: https://coveralls.io/r/expressjs/express?branch=master

[github-actions-ci-image]: https://badgen.net/github/checks/expressjs/express/master?label=linux

[github-actions-ci-url]: https://github.com/expressjs/express/actions/workflows/ci.yml

[npm-downloads-image]: https://badgen.net/npm/dm/express

[npm-downloads-url]: https://npmcharts.com/compare/express?minimal=true

[npm-install-size-image]: https://badgen.net/packagephobia/install/express

[npm-install-size-url]: https://packagephobia.com/result?p=express

[npm-url]: https://npmjs.org/package/express

[npm-version-image]: https://badgen.net/npm/v/express