JavaScript - JSON.stringify() reverse

The method you are looking for is JSON.parse().

Practical example

// ONLINE-RUNNER:browser;

var jsonString = '{"id": 2, "name": "Tom", "age": 25}';

try {
    var object = JSON.parse(jsonString);
} catch (e) {
    console.error(e);
}

console.log(object.id);   // 2
console.log(object.name); // Tom
console.log(object.age);  // 25

Note:

Put JSON.parse() into try-catch block, as the method can crash your code.

See also

1. ❤ 💻 JavaScript - parse json - Dirask

References

1. JSON.parse() - JavaScript | MDN