node-router-decorator

Simple router ES7 decorators for Node.js.

This library implemented on top of the ES7 decorators proposal. Which can only be used with transpilers such as Babel.

Installation

$ npm install --save router-decorator

Usage

Use in Node.js

import http from 'http';
import {router, route} from 'router-decorator';

function setHeaders(req, res, next) {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  next();
}

@router
class MyApp {
  @route('/', setHeaders)
  index(req, res) {
    res.end('Hello World\n');
  }

  @route('/users/:userId', setHeaders)
  user(req, res) {
    res.end(`Hello ${req.params.userId}\n`);
  }

  @route(/^\/posts\/(\d+)/, setHeaders)
  post(req, res) {
    res.end(`Hello ${req.params[1]}\n`);
  }
}

http.createServer(new MyApp()).listen(3000, () => {
  console.log('Example app listening on port 3000');
});

Use with Express

import express from 'express';
import {router, route} from 'router-decorator';

const app = express();

@router
class MyApp {
  @route('/')
  index(req, res) {
    res.send('Hello World\n');
  }

  @route('/users/:userId')
  user(req, res) {
    res.send(`Hello ${req.params.userId}\n`);
  }

  @route(/^\/posts\/(\d+)/)
  post(req, res) {
    res.send(`Hello ${req.params[1]}\n`);
  }
}

app.use(new MyApp('hello'));

app.listen(3000, () => {
  console.log('Example app listening on port 3000');
});

API

@router(options = {})

Class that is marked with this decorator is constructed as router middleware and its annotated methods are registered as routes.

options

Name	Description	Default
methods	Allowed HTTP methods.	['GET', 'POST', 'PUT', 'DELETE']

@route(matcher, method = 'GET', ...middleware)

Methods marked with this decorator will register a request made with given method HTTP method to a path that matches the given matcher.

matcher

type: string|RegExp|function

Path matcher for the route; can be any of:

• A string representing a path.
• A path with named parameter.
• A regular expression pattern to match paths.
• A function that returns an array or null taking an argument of path.

Path matcher examples

The following table provides some simple examples of valid path matcher value.

Type	Example	Description
Path	@route('/abcd')	This will match paths starting with /abcd.
Named parameter	@route('/abcd/:id')	This will match paths starting with /abcd, and set a value of the path segment located at the :id to req.params.
Regular expression	`@route(//abc	/xyz/)`
Function	@route((path) => path.startWith('efg'))	This will match paths starting with /efg.

method

type: string

HTTP method for the route. If the asterisk is specified, applies to the all methods that are allowed by the router methods option.

middleware

type: function

Express-style middleware for the route.

License

MIT