在nodejs中獲取request.body值undefined？

Question

我的前端代碼：

console.log('In front end ', UserDetails.fname); 
    $.ajax({ 
     type: 'POST', 
     data: UserDetails.fname, 
     url: 'http://localhost:3000', 
     success: function(data){ 
      console.log('Success!!'); 
     }, 
     error: function(error){ 
      console.log('Error!!'); 
     } 
    }) 

在第一控制檯線路的UserDetails.fname打印正確。但是當我將它發送到後端時，後端將其顯示爲undefined。

我的後端代碼

var express = require('express'); 
var mysql = require('mysql'); 
var bodyParser = require('body-parser'); 
var userId = 1; 
var conn = mysql.createConnection({ 
    host: 'localhost', 
    user: 'root', 
    password: '', 
    database: 'facebook' 
}); 

conn.connect(function(err){ 
    if(!err){ 
     console.log('Database connection success...'); 
    } else { 
     console.log('Failed to connect to database...') 
    } 

}); 
var app = express(); 
// Add headers 
app.use(function (req, res, next) { 
    res.setHeader('Access-Control-Allow-Origin', '*'); 
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE'); 
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type'); 
    res.setHeader('Access-Control-Allow-Credentials', true); 
    next(); 
}); 

app.use(bodyParser.json({ type: 'application/*+json' })); 
app.use(bodyParser.raw({ type: 'application/vnd.custom-type' })); 
app.use(bodyParser.text({ type: 'text/html' })); 

app.post("/", function(req, res){ 
    console.log(req.headers); 
    console.log('body: ' + JSON.stringify(req.body)); 
    res.send(req.body); 
}); 
app.listen(3000); 

我已經更新了我的代碼。但我仍然有同樣的問題。

Answer 1

確保把你body-parser代碼的所有路由

var bodyParser = require('body-parser'); 

var app = express(); 
app.use(bodyParser.json()); 
app.use(bodyParser.urlencoded({ extended: false })); 

Answer 2

你是否在express中設置了一個body解析器？

https://github.com/expressjs/body-parser#user-content-change-accepted-type-for-parsers