node.js中express中间件body-parser的介绍与用法详解

var express = require('express')
var bodyParser = require('body-parser')
 
var app = express()
 
// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))
 
// parse application/json
app.use(bodyParser.json())
 
app.use(function (req, res) {
 res.setHeader('Content-Type', 'text/plain')
 res.write('you posted:\n')
 res.end(JSON.stringify(req.body, null, 2))
})

var express = require('express')
var bodyParser = require('body-parser')
 
var app = express()
 
// create application/json parser
var jsonParser = bodyParser.json()
 
// create application/x-www-form-urlencoded parser
var urlencodedParser = bodyParser.urlencoded({ extended: false })
 
// POST /login gets urlencoded bodies
app.post('/login', urlencodedParser, function (req, res) {
 if (!req.body) return res.sendStatus(400)
 res.send('welcome, ' + req.body.username)
})
 
// POST /api/users gets JSON bodies
app.post('/api/users', jsonParser, function (req, res) {
 if (!req.body) return res.sendStatus(400)
 // create user in req.body
})

// parse various different custom JSON types as JSON
app.use(bodyParser.json({ type: 'application/*+json' });

// parse some custom thing into a Buffer
app.use(bodyParser.raw({ type: 'application/vnd.custom-type' }));

// parse an HTML body into a string
app.use(bodyParser.text({ type: 'text/html' }));