node side fetch example with express and body-parser

nodeSideFetch.js

let router = require('express').Router();
let bodyParser = require('body-parser');

// parse application/json
router.use(bodyParser.json());

router.put('/api/update', update);

function update(req, res) {
  console.log('updating-', req.body);
  res.sendStatus(200);
}