url-router

A Trie-based router.

V13 Breaking Change

The constructor's routes parameter changed to key-value object that key is pattern and value is handler.

Installation

npm install url-router

NOTE: This package is written in ES2020 syntax and not transpiled. It is tested only on Node.js v14 LTS. To use it in old browsers, you should transpile the code using tools such as Babel.

Examples

import assert from 'assert';
import Router from 'url-router';

const router = new Router({
  '/foo': 1,
  '/foo/bar': 2,
  '/user/:id': 3,
  '/user/:id/:page': 4,
  '/people/:name(\\w+)': 5,
  '(.*)': 6,
  '/:year(\\d+)-:month(\\d+)': 7
});

assert.deepStrictEqual(
  router.find('/foo'),

  {
    handler: 1,
    params: {}
  }
);

assert.deepStrictEqual(
  router.find('/foo/bar'),

  {
    handler: 2,
    params: {}
  }
);

assert.deepStrictEqual(
  router.find('/user/123'),

  {
    handler: 3,
    params: {
      id: '123'
    }
  }
);

assert.deepStrictEqual(
  router.find('/user/456/articles'),

  {
    handler: 4,
    params: {
      id: '456',
      page: 'articles'
    }
  }
);

assert.deepStrictEqual(
  router.find('/people/john'),

  {
    handler: 5,
    params: {
      name: 'john'
    }
  }
);

assert.deepStrictEqual(
  router.find('/404'),

  {
    handler: 6,
    params: {}
  }
);

assert.deepStrictEqual(
  router.find('/2019-11'),

  {
    handler: 7,
    params: {
      year: '2019',
      month: '11'
    }
  }
);

API

Router

const routes = {
  pattern_1: handler_1,
  pattern_2: handler_2,
  ...
};

router = new Router(routes);

Creates a router instance.

Params

routes

Optional. A key-value object that key is pattern and value is handler. See router.add() below for how to define pattern and handler.

router.add

router.add(pattern, handler)

Adds a route entry.

Params

pattern

String. The pattern to match against the request path.

You can define params in pattern, for example:

const router = new Router();
router.add('/people/:username/:year(\\d+)-:month(\\d+)/:articleId(\\d+)', handler);
const result = router.find('/people/johnsmith/2020-02/123');
/*
result:
{
  handler: handler,
  params: {
    username: 'johnsmith',
    year: '2020',
    month: '02,
    articleId: '123'
  }
}
*/

If regex is omitted, it defaults to [^/]+.

You can also use regex without setting the parameter name, for example:

router.add('(.*)', NotFound)

This defines a catch-all route.

handler

any. The handler you wish to handle the request. Based on your framework design, the handler can be a function to handle the request, or the file path to your controller file, or an object (such as Vue component), etc.

Returns

The router instance. So you could use method chaining:

router
  .add('/foo', foo)
  .add('/bar', bar)

router.find

router.find(path)

Finds the route which matches the path.

Parameters

path

String. The request path.

Returns

handler and params of the route:

{
  handler,
  params
}

Or null if not found.

License

MIT