Moa-router NPM

moa-router

a better && faster router base on find-my-way(support koa/express/http)

A crazy fast HTTP router, internally uses an highly performant Radix Tree (aka compact Prefix Tree), supports route params, wildcards, and it's framework independent.

If you want to see a benchmark comparison with the most commonly used routers, see here.
Do you need a real-world example that uses this router? Check out Fastify.

Performace

$ autocannon 127.0.0.1:3000/test

QPS

moa-router(http) 28456
moa-router(koa) 17439.6
koa-router 12748.73
moa-router(express) 11779.1
express-router 10374.6

Install

$ npm i --save moa-router

Usage

Koa

const http = require('http')
const Koa = require('koa');
const app = new Koa();

const router = require('moa-router')()

router.get('/', (ctx, next) => {
  ctx.body = {'path': 'root'}
})

router.on('GET', '/test', (ctx, next) => {
  ctx.body = {'hello': 'world'}
})

app.use(router.routes());

app.use(async function (ctx, next) {
  ctx.body = "default"
});

const server = http.createServer(app.callback())

server.listen(3030, err => {
  if (err) throw err
  console.log('Server listening on: http://localhost:3000')
})

Express

const http = require('http')
const express = require('express')
const app = express()

const router = require('moa-router')()
router.type = 'express'

router.get('/', (req, res, next) => {
  res.json({'path': 'root'}) 
})

router.on('GET', '/test', (req, res, next) => {
  res.json({'hello': 'world'})
})

app.use(router.routes())

app.use(async function (ctx, next) {
  res.send("default")
})

const server = http.createServer(app)

server.listen(3000, err => {
  if (err) throw err
  console.log('Server listening on: http://localhost:3000')
})

HTTP(fastify)

'use strict'

const http = require('http')
const router = require('moa-router')()
router.type = 'http'

router.on('GET', '/test', (req, res, params) => {
  res.end('{"hello":"world"}')
})

const server = http.createServer(router.routes())

server.listen(3000, err => {
  if (err) throw err
  console.log('Server listening on: http://localhost:3000')
})

API

FindMyway(options)

Instance a new router.
You can pass a default route with the option defaultRoute.

const router = require('moa-router')({
  defaultRoute: (ctx, next) => {
    ctx.status = 404
  }
})

on(method, path, handler, store)

router.on('GET', '/example', (ctx, next) => {
  // your koa code
})

Last argument, store is used to pass an object that you can access later inside the handler function. If needed, store can be updated.

router.on('GET', '/example', (ctx, next) => {
  assert.equal(ctx.store, { message: 'hello world' })
}, { message: 'hello world' })

on(methods[], path, handler, store)

Register a new route for each method specified in the methods array. It comes handy when you need to declare multiple routes with the same handler but different methods.

router.on(['GET', 'POST'], '/example', (ctx, next) => {
  // your code
})

Supported path formats

To register a parametric path, use the colon before the parameter name. For wildcard use the star. Remember that static routes are always inserted before parametric and wildcard.

// parametric
router.on('GET', '/example/:userId', (ctx, next) => {}))
router.on('GET', '/example/:userId/:secretToken', (ctx, next) => {}))

// wildcard
router.on('GET', '/example/*', (ctx, next) => {}))

Regular expression routes are supported as well, but pay attention, RegExp are very expensive in term of performance!

// parametric with regexp
router.on('GET', '/example/:file(^\\d+).png', () => {}))

It's possible to define more than one parameter within the same couple of slash ("/"). Such as:

router.on('GET', '/example/near/:lat-:lng/radius/:r', (ctx, next) => {}))

Remember in this case to use the dash ("-") as parameters separator.

Finally it's possible to have multiple parameters with RegExp.

router.on('GET', '/example/at/:hour(^\\d{2})h:minute(^\\d{2})m', (ctx, next) => {}))

In this case as parameter separator it's possible to use whatever character is not matched by the regular expression.

Having a route with multiple parameters may affect negatively the performance, so prefer single parameter approach whenever possible, especially on routes which are on the hot path of your application.

Match order

The routes are matched in the following order:

static
parametric
wildcards
parametric(regex)
multi parametric(regex)

Caveats

Since static routes have greater priority than parametric routes, when you register a static route and a dynamic route, which have part of their path equal, the static route shadows the parametric route, that becomes not accessible. For example:

const assert = require('assert')
const router = require('moa-router')({
  defaultRoute: (ctx, next) => {
    assert(ctx.req.url === '/example/shared/nested/oops')
  }
})

router.on('GET', '/example/shared/nested/test', (ctx, next) => {
  assert.fail('We should not be here')
})

router.on('GET', '/example/:param/nested/oops', (ctx, next) => {
  assert.fail('We should not be here')
})

router.lookup({ method: 'GET', url: '/example/shared/nested/oops' }, null)

It's not possible to register two routes which differs only for their parameters, because internally they would be seen as the same route. In a such case you'll get an early error during the route registration phase. An example is worth thousand words:

const findMyWay = FindMyWay({
  defaultRoute: (ctx, next) => {}
})

findMyWay.on('GET', '/user/:userId(^\\d+)', (ctx, next) => {})

findMyWay.on('GET', '/user/:username(^[a-z]+)', (ctx, next) => {})
// Method 'GET' already declared for route ':'

Shorthand methods

If you want an even nicer api, you can also use the shorthand methods to declare your routes.

router.get(path, handler [, store])
router.delete(path, handler [, store])
router.head(path, handler [, store])
router.patch(path, handler [, store])
router.post(path, handler [, store])
router.put(path, handler [, store])
router.options(path, handler [, store])
router.trace(path, handler [, store])
router.connect(path, handler [, store])

If you need a route that supports all methods you can use the all api.

router.all(path, handler [, store])

lookup(ctx, next)

Start a new search, ctx and next are the server ctx.req/ctx.res objects.
If a route is found it will automatically called the handler, otherwise the default route will be called.
The url is sanitized internally, all the parameters and wildcards are decoded automatically.

router.lookup(ctx, next)

find(method, path)

Return (if present) the route registered in method:path.
The path must be sanitized, all the parameters and wildcards are decoded automatically.

router.find('GET', '/example')
// => { handler: Function, params: Object, store: Object}
// => null

prettyPrint()

Prints the representation of the internal radix tree, useful for debugging.

findMyWay.on('GET', '/test', () => {})
findMyWay.on('GET', '/test/hello', () => {})
findMyWay.on('GET', '/hello/world', () => {})

console.log(findMyWay.prettyPrint())
// └── /
//   ├── test (GET)
//   │   └── /hello (GET)
//   └── hello/world (GET)