1var obj = {a: "a", b: "b" /*...*/};
2var string = JSON.stringify(obj);
3// OUTPUT:
4// "{'a':'a', 'b':'b'}"

1let data = {
2  name: "John Smith",
3  age: 30,
4  hobbies: ["Programming", "Video Games"]
5};
6
7// {name:"John Smith",age:30,hobbies:["Programming","Video Games"]}
8let miny = JSON.stringify(data);
9
10// The 4 parameter signifys 4 spaces. You can also use "\t".
11/* {
12 *     name: "John Smith",
13 *     age: 30,
14 *     ...
15 */
16let pretty = JSON.stringify(data, null, 4);

1var obj = {name: "Martin", age: 30, country: "United States"};
2 
3// Converting JS object to JSON string
4var json = JSON.stringify(obj);
5 
6console.log(json);
7// Prints: {"name":"Martin","age":30,"country":"United States"} 
8"https://www.tutorialrepublic.com/faq/how-to-convert-js-object-to-json-string.php"

1var person={"first_name":"Tony","last_name":"Hawk","age":31};
2var personJSONString=JSON.stringify(person); 

1const myObj = {
2  name: 'Skip',
3  age: 2,
4  favoriteFood: 'Steak'
5};
6
7const myObjStr = JSON.stringify(myObj);
8
9console.log(myObjStr);
10// "{"name":"Skip","age":2,"favoriteFood":"Steak"}"
11
12console.log(JSON.parse(myObjStr));
13// Object {name:"Skip",age:2,favoriteFood:"Steak"}

1var jsonPerson = '{"first_name":"billy", "age":23}';
2var personObject = JSON.parse(jsonPerson); //parse json string into JS object