Dynamic Routes with localization for Next.js

Based on Next-Routes with these changes:

• No support for unnamed routes
• Route can be added only by name, locale and pattern (and optionally page) or options object
• Link and Router generate URLs only by route definition (name + params)
• URLs are prefixed with locale (ie. /en/about)
• Routes can have data object (if you generate routes dynamically you can pass custom data there)
• default RequestHandler set locale and nextRoute properties on request (you can get data with req.nextRoute.data)

How to use

Install:

npm install next-routes-with-locale --save

Create routes.js inside your project:

const routes = module.exports = require('next-routes-with-locale')({ locale: 'en' })

routes
.add('about', 'en', '/about')
.add('blog', 'en', '/blog/:slug')
.add('blog', 'en', '/blog/:slug', {myCustom: 'data'})
.add('user', 'en', '/user/:id', 'profile', {myCustom: 'data'})
.add({name: 'beta', locale: 'en', pattern: '/v3', page: 'v3'})
.add('about', 'cs', '/o-projektu')
.add('blog', 'cs', '/blog/:slug')
.add('user', 'cs', '/uzivatel/:id', 'profile')
.add({name: 'beta', locale: 'cs', pattern: '/v3', page: 'v3'})

This file is used both on the server and the client.

API:

• routes.add(name, locale, pattern = /name, page = name, data)
• routes.add(object)

Arguments:

• name - Route name (e.g. about)
• locale - Locale of the route (e.g. fr)
• pattern - Route pattern (e.g. /about; like express, see path-to-regexp)
• page - Page inside ./pages to be rendered; can be ommited (it takes by default the route name as the page name)
• data - Custom data object

The page component receives the matched URL parameters merged into query

export default class Blog extends React.Component {
  static async getInitialProps ({query}) {
    // query.slug
  }
  render () {
    // this.props.url.query.slug
  }
}

On the server

// server.js
const next = require('next')
const routes = require('./routes')
const app = next({dev: process.env.NODE_ENV !== 'production'})
const handler = routes.getRequestHandler(app)

// With express
const express = require('express')
app.prepare().then(() => {
  express().use(handler).listen(3000)
})

// Without express
const {createServer} = require('http')
app.prepare().then(() => {
  createServer(handler).listen(3000)
})

RequestHandler automatically sets req.locale to locale of matched route so you can use it in your app.

Optionally you can pass a custom handler, for example:

const handler = routes.getRequestHandler(app, ({req, res, route, query}) => {
  app.render(req, res, route.page, query)
})

Make sure to use server.js in your package.json scripts:

"scripts": {
  "dev": "node server.js",
  "build": "next build",
  "start": "NODE_ENV=production node server.js"
}

On the client

Import Link and Router from your routes.js file to generate URLs based on route definition:

Link example

// pages/index.js
import {Link} from '../routes'

export default () => (
  <div>
    <div>Welcome to Next.js!</div>
    <Link href='blog' params={{slug: 'hello-world'}}>
      <a>Hello world</a>
    </Link>
    or
    <Link href='blog' locale='cs' params={{slug: 'ahoj-svete'}}>
      <a>Hello world</a>
    </Link>
  </div>
)

API:

• <Link href='name'>...</Link>
• <Link href='name' locale='locale'>...</Link>
• <Link href='name' params={params}> ... </Link>
• <Link href='name' locale='locale' params={params}> ... </Link>

Props:

• href - Route name to match (the name, not the pattern)
• params - Optional parameters

It generates the URLs prefixed with the locale for href and as and renders next/link. Other props like prefetch will work as well.

Router example

// pages/blog.js
import React from 'react'
import {Router} from '../routes'

export default class Blog extends React.Component {
  handleClick () {
    // With route name and params
    Router.pushRoute('blog', {slug: 'hello-world'})
    // With route name and params and explicit locale
    Router.pushRoute('blog', {slug: 'hello-world'}, 'en')
  }
  render () {
    return (
      <div>
        <div>{this.props.url.query.slug}</div>
        <button onClick={this.handleClick}>Home</button>
      </div>
    )
  }
}

API:

• Router.pushRoute(route, params) - automatically get current locale
• Router.pushRoute(route, params, locale)
• Router.pushRoute(route, params, locale, options)

Arguments:

• route - Route name
• locale - Route locale
• params - Optional parameters for named routes
• options - Passed to Next.js

The same works with .replaceRoute() and .prefetchRoute()

It generates the URLs and calls next/router

---

Optionally you can provide custom Link and Router objects, for example:

const routes = module.exports = require('next-routes-with-locale')({
  Link: require('./my/link')
  Router: require('./my/router')
})

---

Related links

• zeit/next.js - Framework for server-rendered React applications
• path-to-regexp - Express-style path to regexp