Basic json parser with error handling.
\"Daniil Serov\"
[[], [[]]]
[[], [1], 2, [[3, [" "]]]]
[1, {a: \"hello\", b: [1, 2, 3]}, null]
{employees: [{John: {age: 20, car: null}}, {Anna: {age: 23, car: \"Lada\"}}]}