create a json object 'persons' with fields code example

Example 1: json object

var myObj, x;
myObj = {"name":"John", "age":30, "car":null};
x = myObj.name;
document.getElementById("demo").innerHTML = x;

Example 2: create a javascript json object

const student = {
  name: "bob",
  age: 7,
  grade: 6
}