Sign Up for Free

RunKit +

Try any Node.js package right in your browser

This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 400,000 packages pre-installed, including express with all npm packages installed. Try it out:

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

This service is provided by RunKit and is not affiliated with npm, Inc or the package authors.

express v4.15.3

Fast, unopinionated, minimalist web framework

Express Logo

Fast, unopinionated, minimalist web framework for node.

NPM Version NPM Downloads Linux Build Windows Build Test Coverage

var express = require('express')
var app = express()

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

app.listen(3000)

Installation

$ npm install express

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 Migrating from 3.x to 4.x as well as New features in 4.x.

Security Issues

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

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

Philosophy

The Express philosophy is to provide small, robust tooling for HTTP servers, making it a great solution for single page applications, web sites, 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:

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

Then run whichever example you want:

$ node examples/content-negotiation

Tests

To run the test suite, first install the dependencies, then run npm test:

$ npm install
$ npm test

People

The original author of Express is TJ Holowaychuk TJ's Gratipay

The current lead maintainer is Douglas Christopher Wilson Doug's Gratipay

List of all contributors

License

MIT

Metadata

RunKit is a free, in-browser JavaScript dev environment for prototyping Node.js code, with every npm package installed. Sign up to share your code.
Sign Up for Free