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layout: home
title: Express - Node.js web application framework
description: "Express is a fast, unopinionated, minimalist web framework for Node.js, providing a robust set of features for web and mobile applications."
menu: home
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---

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    <section id="description">
        <div class="express"><span>Express</span><a href="https://github.com/expressjs/express/releases" id="express-version">{{ site.data.express.current_version }}</a></div>
        <h1 class="description">Fast, unopinionated, minimalist web framework for <a href='https://nodejs.org/en/'>Node.js</a></h1>
    </section>
    <pre class="install-command"><code>$ npm install express --save</code></pre>
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```javascript
const express = require('express')
const app = express()
const port = 3000

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

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})
```

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<section id="intro">
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    <div id="web-applications">
      <h2>Web Applications</h2> Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications.
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    <div id="apis">
      <h2>APIs</h2> With a myriad of HTTP utility methods and middleware at your disposal, creating a robust API is quick and easy.
    </div>
    <div id="performance">
      <h2>Performance</h2> Express provides a thin layer of fundamental web application features, without obscuring Node.js features that you know and love.
    </div>
    <div id="middleware">
      <h2>ミドルウェア</h2> 
      Express is a lightweight and flexible routing framework with minimal core features 
      meant to be augmented through the use of Express <a href="{{ page.lang }}/resources/middleware.html">middleware</a> modules.
    </div>
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</section>
