A tiny URL router for Nano Stores state manager.

• Small. 684 bytes (minified and brotlied). Zero dependencies.
• Good TypeScript support.
• Framework agnostic. Can be used with React, Preact, Vue, Svelte, Angular, Solid.js, and vanilla JS.

Since Nano Stores promote moving logic to store, the router is a store, not a component in UI framework like React.

// stores/router.ts
import { createRouter } from '@nanostores/router'

export const $router = createRouter({
  home: '/',
  list: '/posts/:category',
  post: '/posts/:category/:post'
})

Store in active mode listen for <a> clicks on document.body and Back button in browser.

// components/layout.tsx
import { useStore } from '@nanostores/react'

import { $router } from '../stores/router.js'

export const Layout = () => {
  const page = useStore($router)

  if (!page) {
    return <Error404 />
  } else if (page.route === 'home') {
    return <HomePage />
  } else if (page.route === 'list') {
    return <ListPage category={page.params.category} filters={page.search} />
  } else if (page.route === 'post') {
    return <PostPage post={page.params.post} />
  }
}

Made in Evil Martians, product consulting for developer tools.

npm install nanostores @nanostores/router

See Nano Stores docs about using the store and subscribing to store’s changes in UI frameworks.

Routes is an object of route’s name to route pattern:

createRouter({
  route1: '/',
  route2: '/path/:var1/and/:var2',
  route3: /\/posts\/(?<type>draft|new)\/(?<id>\d+)/
})

For string patterns you can use :name for variable parts. To make the parameter optional, mark it with the ? modifier:

createRouter({
  routeName: '/profile/:id?/:tab?'
})

Routes can have RegExp patterns. They should be an array with function, which convert () groups to key-value map.

For TypeScript, router parameters will be converted to types automatically. You need to use TypeScript ≥5.x.

createRouter({
  routeName: '/path/:var1/and/:var2',
  routeName2: [/path2/, () => ({ num: 1, str: '' })]
})

/**
 * Params will be inferred as:
 * {
 *   routeName: { var1: string, var2: string },
 *   routeName2: { num: number, str: string }
 * }
 */

Router value contains parsed URL search params (like ?sort=name):

createRouter({ home: '/posts/:category' })

location.href = '/posts/general?sort=name'
router.get() //=> {
//                   path: '/posts/general',
//                   route: 'list',
//                   params: { category: 'general' },
//                   search: { sort: 'name' }
//                 }

To disable the automatic parsing of search params in routes you need to set search option. Router will now treat search query like ?a=1&b=2 as a string. Parameters order will be critical.

createRouter({ home: '/posts?page=general' }, { search: true })

location.href = '/posts/?page=general'
router.get() //=> {
//                   path: '/posts?page=general',
//                   route: 'list',
//                   params: { },
//                   search: { }
//                 }

By default, router and ?search params store will add click event listener on window to track links clicks.

To disable click tracking for specific link, add target="_self" to link tag:

<a href="/posts" target="_self">Posts</a>

You can disable this behavior by links: false options and create custom <Link> component.

export const $router = createRouter({ … }, { links: false })

function onClick (e) {
  let link = event.target.closest('a')
  if (isPjax(link, e)) {
    $router.open(new Url(link.href).pathname)
  }
}

export const Link = (props) => {
  return <a onClick={onClick} {...props}></a>
}

Using getPagePath() avoids hard coding URL in templates. It is better to use the router as a single place of truth.

import { getPagePath } from '@nanostores/router'

…
  <a href={getPagePath($router, 'post', { category: 'guides', post: '10' })}>

If you need to change URL programmatically you can use openPage or redirectPage:

import { openPage, redirectPage } from '@nanostores/router'

function requireLogin() {
  openPage($router, 'login')
}

function onLoginSuccess() {
  // Replace login route, so we don’t face it on back navigation
  redirectPage($router, 'home')
}

All functions accept search params as last argument:

getPagePath($router, 'list', { category: 'guides' }, { sort: 'name' })
//=> '/posts/guides?sort=name'

Router can be used in Node environment without window and location. In this case, it will always return route to / path.

You can manually set any other route:

if (isServer) {
  $router.open('/posts/demo/1')
}