JSON JavaScript Methods

const jsonString = '{"name":"John","age":25}';
const obj = JSON.parse(jsonString);
console.log(obj.name); # "John"

const obj = { name: 'John', age: 25 };
const jsonString = JSON.stringify(obj);
console.log(jsonString); # '{"name":"John","age":25}'

JSON.stringify(obj, null, 2); # indented with 2 spaces
JSON.stringify(obj, null, '	'); # indented with tabs

JSON.stringify(obj, (key, value) => {
    if (typeof value === 'string') {
        return value.toUpperCase();
    }
    return value;
}); # transform values

JSON.parse(jsonString, (key, value) => {
    if (key === 'date') {
        return new Date(value);
    }
    return value;
}); # transform parsed values

const obj = { name: 'John', age: 25, password: 'secret' };
JSON.stringify(obj, ['name', 'age']); # only include specified keys