how to read response json node code example

Example 1: node.js return json

server.get('/', (req, res) => {
  const user = { name: 'Hero', isLearning: true, level: 'apprentice' };
  return res.json(user);
})

Example 2: node js return json

var http = require('http');

var app = http.createServer(function(req,res){
    res.setHeader('Content-Type', 'application/json');
    res.end(JSON.stringify({ a: 1 }));
});
app.listen(3000);

// > {"a":1}