用expressjs写RESTful API

expressjs

expressjs是一个基于nodejs的web开发框架: http://expressjs.com/ ,这篇博客目的就是用expressjs写一个关于products的最简单的RESTful API

一个最简单express的例子

package.json

{

  "name": "hello-world",

  "description": "hello world of express js",

  "version": "0.0.1",

  "private": true,

  "dependencies": {

    "express": "4.4.x"

  }

}

安装express:

npm install

app.js

var express = require('express')

var app = express();

app.get('/hello', function(req, res){

   res.send('hello world')

});

var server = app.listen(3000, function() {

   console.log('listening on port %d', server.address().port);

});

运行:

node app

RESTful API

GET  /products

var express = require('express')

var app = express();

var products = [

   { name: 'apple juice', description: 'good', price: 12.12 },

   { name: 'banana juice', description: 'just so sos', price: 4.50 }

]

app.get('/products', function(req, res) {

   res.json(products);

});

var server = app.listen(3000, function() {

   console.log('listening on port %d', server.address().port);

})

GET /products/:id => 200

app.get('/products/:id', function(req, res) {

   res.json(products[req.params.id]);

})

GET /products/:id => 404

app.get('/products/:id', function(req, res) {

   if (products.length <= req.params.id || req.params.id < 0) {

      res.statusCode = 404;

      return res.send('Error 404: No products found')

   }

   res.json(products[req.params.id]);

})

POST /products => 201

因为我们在接受POST请求的时候,需要解析POST的body,所以,我们就要使用middleware来做这件事情,在早期版本中提供了bodyParser这样的方式。但是这种方式会创建大量的临时文件。所以,我们应该直接使用json或者urlencoded这样的middleware直接解析

在package.json中添加依赖:

    "body-parser": "1.4.3"

var express = require('express'),

   bodyParser = require('body-parser')

var app = express()

   .use( bodyParser.json() );

app.post('/products', function(req, res) {

   var newProduct = {

      name: req.param('name'),

      description: req.param('description'),

      price: req.param('price')

   }

   products.push(newProduct);

   res.statusCode = 201;

   res.location('/products/' + products.length);

   res.json(true);

});

POST /products => 400

app.post('/products', function(req, res) {

   if (typeof req.param('name') === "undefined" ||

      typeof req.param('description') === "undefined" ||

      typeof req.param('price') === "undefined") {

      res.statusCode = 400;

      res.send('Error 400: products properties missing');

   }

   //......

});

参考资料:

http://blog.modulus.io/nodejs-and-express-create-rest-api

http://erichonorez.wordpress.com/2013/02/10/how-create-a-rest-api-with-node-js-and-express/

http://andrewkelley.me/post/do-not-use-bodyparser-with-express-js.html

http://hawkee.com/snippet/10141/

https://github.com/expressjs/body-parser

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