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Fast, unopinionated, minimalist web framework for Node.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.
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
- 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) 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 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
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.
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:
$ npm install
$ npm test
People
The original author of Express is TJ Holowaychuk
The current lead maintainer is Douglas Christopher Wilson