JSON is lightweight (not as verbose as XML) and text-based, so it is easily readable by humans. It starts from the notion that the state (or content) of an object is in fact like a map; the keys are the field names, and their values are the concrete data stored in the fields. For example, (see project json/job.dart), say we have a class Job defined, as shown in the following code:

class Job {
  String type;
  int salary;
  String company;
  Job(this.type, this.salary, this.company);
}

Next, we construct a job object with the following code:

var job = new Job("Software Developer", 7500, "Julia Computing  LLC") ;

Then, it can be represented as the following JSON string:

 '{
     "type": "Software Developer...