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5.1.2 • Public • Published


The brother router to help in React apps

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  • Strongly typed ecosystem (based in your routes)
  • Simple API (abstract history API)
  • Easy configure NotFound route
  • Utility hooks and functions to work with URLs
  • Hook to get your current route and decide where you can render it
  • Use error boundary to catch NotFound errors

The main idea of brouther is connecting your URLs in your system, to grant the correct types and records to avoid code duplication and grant security with the type system.

Brouther can extract the correct dynamic paths (or params) from your URL and infer the correct type for them. The same for query-string, and you can add the types of each property of query string (see useQueryString).

Usign Brouther you have a copilot to work with routes:

  • Helping you on find deleted routes
  • Identify changed paths/params/query-string
  • write less code
  • provide a dictionary to access our routes

Table of content


# using npm
npm i brouther
# using yarn
yarn add brouther
# using pnpm
pnpm add brouther


You can find the example in playground or just clone local

// main.tsx
import React from "react";
import ReactDOM from "react-dom/client";
import App from "./App";
import { Brouther, createRouter } from "brouther";
import Root from "./pages/root";
import UserIdAddress from "./pages/user-id-address";

const Users = React.lazy(() => import("./pages/users"));

export const router = createRouter([
    path: "/",
    id: "index",
    element: <Root />,
    path: "/user/:id/address/?sort=string",
    id: "addressList",
    element: <UserIdAddress />,
    path: "/users?id=number!",
    id: "users",
    element: <Users />,
    path: "/posts/:title?language=string[]!",
    id: "post",
    element: <Users />,
] as const); // use "as const" grant the immutability in array

ReactDOM.createRoot(document.getElementById("root") as HTMLElement).render(
    <React.Suspense fallback={<div>Loading...</div>}>
      <Brouther config={config}>
        <App />

How brouther works?

When you create your router configuration, the method createRouter return a bunch of things:

  • links: Brouther transform your routes array in an object, using the id as key and the path as value, to avoid you to copy and paste or create object with all your paths. The id is an alias for the route
  • link: A method that takes and register route (used in your routes array) and required the query string and dynamic paths to create a URL
  • usePaths: Takes the path and return an object with the dynamic paths with the correct keys. All values in this object are string
  • useQueryString: The same of usePaths, but extract the query-string and transform the values by according your values
  • config: The configured routes to use in <Brouther />, the basename and the history object using the createBrowserHistory of history


This method is the entrypoint to create your routes and configure basename, history and any other thing for your routing system. createRouter is responsible to provide a fully typed ecosystem, to do this, you need to provide your routes using as const. This grant type safe.

When you configure your routes, you need to use this method or createMappedRouter. After this, createRouter will return

  • navigation: the methods to manipulate your routes outside the components
  • link: typed method to create links based on your routes
  • links: a dictionary with all your routes
  • usePaths: a hook to get all dynamic paths in your current page
  • useQueryString: a hook to get all query-string/URLSearchParams in your current page
  • config: the object used by <Brouther />


The implementation of createRouter but as an object. The key of object is the same of your id when you use createRouter. This is the only difference between them. Choose your prefered way to create your routes. At the example below, both router0 and router1 generate the same configuration for Brouther.

export const router0 = createMappedRouter({
  index: {
    path: "/",
    element: <Root />
  addressList: {
    path: "/user/:id/address/?sort=string",
    element: <UserIdAddress />
} as const);

export const router1 = createMappedRouter([
    id: "index",
    path: "/",
    element: <Root />
    id: "addressList",
    path: "/user/:id/address/?sort=string",
    element: <UserIdAddress />

] as const);



The component <Link /> is an abstraction of the <a />. Just with a little changes, one of these is the connection to brouther history and the other is the properties to help you to build a very strongly typed route.

// use the main.tsx of the previous example
<Link href={} paths={{ title: "typescript-101" }} query={{ language: ["pt-BR"] }}>
  Typescript 101

Based on your route, the Link component will mount the correct properties to improve the DX and you will never forget the parameters of the route.


Brouther two classes of hooks, the strongly typed and the "normal" hooks.

The strongly typed hooks are connected to your routes and can provide autocompletion for query-string, and dynamic paths. Otherwise, the normal hooks do the same thing, but you need to provide your own types.

Strongly typed hooks


This hook extract the current query-string from the URL and apply a transformation using the URL as map. You need to provide a path for, because the hook will extract the values from specific path. To save your time, you can use the router.links object

// use the main.tsx of the previous example
const route = "/posts/:title?language=string[]!";

This route use a query-string language as array, and say "this is required" because has the !. In Brouther, you can type your query-strings using the mapped transformers. These transformers are very powerful, because you don't need to convert the query-string or parse the URLSearchParams. You can use the primitives of Javascript and the Date:

  • string
  • number
  • null
  • boolean
  • date

For any of transformer you can use the version of array. Just put the [] at the end of your transformer.

By default, all values in the query string are optional. If you need to turn any value as required, just use the operator !.

A little list of how these transformers works:

  • /users?sort=string!&from=date&to=date: sort is a required string, from and to are Date and optional, this means you can have undefined or Invalid Date at this values
  • /users?languages=string[]!: languages is a required array of string


Extract the dynamic paths from URL, so you need to provide a pathname. Different of react-router, all dynamic paths in brouther are required, and you cannot have optional dynamic paths.

// use the main.tsx of the previous example
const route = "/posts/:title?language=string[]!";

This hook will extract the title from URL and return an object { title: string }. In this case, you have the URL /posts/typescript-101 you have the result { title: "typescript-101" }

Normal hooks

These hooks aren't connected to the type system, because they work without the need of your configuration.


This hook enable you to get the element that match with the current route. So, you just need to use the component in your system. This hook return a nullable element, because if no one element match with the route, brouther will put at the state a NotFoundRoute.


This hook get the state of error in Brouther ecosystem. If you have a not found route, this hook will return the NotFoundRoute error, and you can build a 404 component using the data.




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