166 lines
5.3 KiB
Markdown
166 lines
5.3 KiB
Markdown
[](http://expressjs.com/)
|
|
|
|
Fast, unopinionated, minimalist web framework for [Node.js](http://nodejs.org).
|
|
|
|
[![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](https://nodejs.org/en/) module available through the
|
|
[npm registry](https://www.npmjs.com/).
|
|
|
|
Before installing, [download and install Node.js](https://nodejs.org/en/download/).
|
|
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](http://expressjs.com/en/starter/installing.html)
|
|
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](http://expressjs.com/) - [[website repo](https://github.com/expressjs/expressjs.com)]
|
|
* [#express](https://web.libera.chat/#express) on [Libera Chat](https://libera.chat) IRC
|
|
* [GitHub Organization](https://github.com/expressjs) for Official Middleware & Modules
|
|
* Visit the [Wiki](https://github.com/expressjs/express/wiki)
|
|
* [Google Group](https://groups.google.com/group/express-js) for discussion
|
|
* [Gitter](https://gitter.im/expressjs/express) for support and discussion
|
|
|
|
**PROTIP** Be sure to read [Migrating from 3.x to 4.x](https://github.com/expressjs/express/wiki/Migrating-from-3.x-to-4.x) as well as [New features in 4.x](https://github.com/expressjs/express/wiki/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](https://github.com/tj/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 https://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](Contributing.md) for more technical details on contributing.
|
|
|
|
### Security Issues
|
|
|
|
If you discover a security vulnerability in Express, please see [Security Policies and Procedures](Security.md).
|
|
|
|
### 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](https://github.com/tj)
|
|
|
|
The current lead maintainer is [Douglas Christopher Wilson](https://github.com/dougwilson)
|
|
|
|
[List of all contributors](https://github.com/expressjs/express/graphs/contributors)
|
|
|
|
## License
|
|
|
|
[MIT](LICENSE)
|
|
|
|
[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
|