Cant get request payload in express js node

Question

This is my Node Express Code,

(function () {
    'use strict';
    var fs = require('fs');
    var cors = require('cors');
    var bodyParser = require('body-parser');
    var express = require('express'),
        app = express(),
        port = 8112;


    app.use(cors());
    app.use(bodyParser.urlencoded({ extended: true }));
    app.use(bodyParser.json());
    app.listen(port);


    app.route('/abc')
        .post(abc);


    function abc(req,res){
        console.dir(req.body);
        res.header("Access-Control-Allow-Origin", "*");
        res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
        res.sendStatus(200);
    }

})();

But Im getting request body as

{}

But in my network Tab in Chrome I can see request payload. Please note OPTIONS is fired before this POST call.

Request headers

POST /abcHTTP/1.1 Host: localhost:8112 Connection:
keep-alive Content-Length: 11 Pragma: no-cache Cache-Control: no-cache
Origin: http://localhost:4200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36
x-api-key:CExkxDlFC35ckfCGX6m61x76GxIYH2h2Iv8bX874
Content-Type:text/plain;charset=UTF-8
Accept: / Referer: http://localhost:4200/dashboard Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9

Request Payload

{"dd":"dd"}

Answer 1

You need to send: Content-Type: application/json for bodyParser.json() to work, without it, your JSON payload won't be parsed, that's why you get: {}

From the docs:

The bodyParser object exposes various factories to create middlewares. All middlewares will populate the req.body property with the parsed body when the Content-Type request header matches the type option, or an empty object ({}) if there was no body to parse, the Content-Type was not matched, or an error occurred.

Example using .fetch:

fetch('http://localhost:4200/dashboard', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({dd: 'dd'})
});