Parsing JSON using Qt

JSON is a popular data-transmitting format after XML. It was first standardized in 2013 and has become the most popular format used on the web ever since. JSON data looks something like this:

{
 "firstName": "John",
 "lastName": "Smith",
 "age": 42,
 "address": {
 "streetAddress": "14 2nd Street",
 "city": "New York",
 "state": "NY",
 "postalCode": "10021-3100"
 },
 "phoneNumbers": [{
 "type": "home",
 "number": "212 686-7890"
 },
 {
 "type": "mobile",
 "number": "321 456-7788"
 }]
}

As you can see, it is completely different from the XML format. The main reason why it is so popular is because of how human-readable it is and how shorter it is compared...