Can't get nodeJS Express post to display body data - node.js

Question

I feel like I've tried everything, would appreciate some fresh eyes to look upon my problem. As the title suggests, I'm sending a http post request to my NodeJS server that is running express, and nodeJS returns the req.body to be undefined/empty.
NodeJS Express Code:
const express = require('express');
const path = require('path');
const app = express();
const PORT = process.env.PORT || 5000;
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With,
Content-Type, Accept");
next();
});
app.post('/addComment', (req, res) => {
console.log(req.body);
});
app.listen(PORT, () => console.log(`Listening on ${ PORT }`));
Javascript Browser Code:
let data = {name: 'aName'};
fetch('http://localhost:5000/addComment', {
method: 'post',
body: JSON.stringify(data)
});

Answer 1

You have to use body-parser middleware :
const bodyParser = require('body-parser')
app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json());
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With,
Content-Type, Accept");
next();
});
app.post('/addComment', (req, res) => {
console.log(req.body);
});
app.listen(PORT, () => console.log(`Listening on ${ PORT }`));
see body-parser.

Answer 2

If you are using the latest express, you can actually use do
const express = require('express');
const path = require('path');
const app = express();
const PORT = process.env.PORT || 5000;
app.use(express.json())
app.use (express.urlencoded({extended: false}))
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With,
Content-Type, Accept");
next();
});
app.post('/addComment', (req, res) => {
console.log(req.body);
});
app.listen(PORT, () => console.log(`Listening on ${ PORT }`));
Express now bundle body-parser by default due to popular demand.