JSFiddle - React, Tailwind, and code Playground

JavaScript

var j1 = {
  name: 'Varun',
  age: 24
};
var j2 = {
  code: 'NodeJS',
  alter: 'C++',
  name: 'Foobar'
}

for (var key in j2) {
  j1[key] = j2[key];
}

console.log(j1);