Req.body in node.express is always undefind

node.express in req.body Always undefind solve

because express take body-parser Separated , So you need to add the following content manually

var path = require('path');
var bodyParser = require('body-parser');// be used for req.body Get the of the value 
app.use(bodyParser.json());
//  establish  application/x-www-form-urlencoded  Code parsing 
app.use(bodyParser.urlencoded({
     extended: false }));

If the content you transmit is not string Type , You need to modify the above configuration , Otherwise, you will always get undefined Result

app.use(bodyParser.urlencoded({
     extended: true}));