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Readme.md

next.js

Next.js is a minimalistic framework for server-rendered React applications.

How to use

The file-system is the main API. Every .js file becomes a route that gets automatically processed and rendered.

Populate ./pages/index.js inside your project:

import React from 'react'
export default () => (
  <div>Welcome to next.js!</div>
)

and then just run next and go to http://localhost:3000

So far, we get:

Automatic transpilation and bundling (with webpack and babel)
Hot code reloading
Server rendering and indexing of ./pages
Static file serving. ./static/ is mapped to /static/

Bundling (code splitting)

Every import you declare gets bundled and served with each page

import React from 'react'
import cowsay from 'cowsay'
export default () => (
  <pre>{ cowsay('hi there!') }</pre>
)

That means pages never load unneccessary code!

CSS

We use Aphrodite to provide a great built-in solution for CSS modularization

import React from 'react'
import { css, StyleSheet } from 'next/css'

export default () => {
  <div className={ css(styles.main) }>
    Hello world
  </div>
})

const styles = StyleSheet.create({
  main: {
    background: 'red',
    '@media (max-width: 600px)': {
      background: 'blue'
    }
  }
})

`<head>` side effects

We expose a built-in component for appending elements to the <head> of the page.

import React from 'react'
import Head from 'next/head'
export default () => (
  <Head>
    <title>My page title</title>
    <meta name="viewport" content="initial-scale=1.0, width=device-width" />
  </Head>
  <p>Hello world!</p>
)

Stateful components

When state, lifecycle hooks or initial data population you can export a React.Component:

import React from 'react'
export default class extends React.Component {
  async getInitialProps ({ isServer, req }) {
    return isServer
      ? { userAgent: req.headers.userAgent }
      : { userAgent: navigator.userAgent }
  }

  render () {
    return <div>
      Hello World {this.props.userAgent}
    </div>
  }
}

Routing

Client-side transitions between routes are enabled via a <Link> component

pages/index.js

import React from 'react'
import Link from 'next/link'
export default () => (
  <div>Click <Link href="/about"><a>here</a></Link> to read more</div>
)

pages/about.js

import React from 'react'
export default () => (
  <p>Welcome to About!</p>
)

Client-side routing behaves exactly like the native UA:

The component is fetched
If it defines getInitialProps, data is fetched. If an error occurs, _error.js is rendered
After 1 and 2 complete, pushState is performed and the new component rendered

Each top-level component receives a url property with the following API:

path - String of the current path excluding the query string
query - Object with the parsed query string. Defaults to {}
push(url) - performs a pushState call associated with the current component
replace(url) - performs a replaceState call associated with the current component
pushTo(url) - performs a pushState call that renders the new url. This is equivalent to following a <Link>
replaceTo(url) - performs a replaceState call that renders the new url

Error handling

404 or 500 errors are handled both client and server side by a default component error.js. If you wish to override it, define a _error.js:

import React from 'react'
export default ({ statusCode }) => (
  <p>An error { statusCode } occurred</p>
)

Production deployment

To deploy, run:

next build
next start

For example, to deploy with now a package.json like follows is recommended:

{
  "name": "my-app",
  "dependencies": {
    "next": "latest"
  },
  "scripts": {
    "dev": "next",
    "build": "next build",
    "start": "next start"
  }
}