What's the difference in using toString() compared to JSON.stringify()?

Question

In both the cases I get in output the content of the object:

alert(JSON.stringify(obj));

or

alert(obj.toString());
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Answer 1

You can use the replacer and space parameter in JSON.stringify, passing the replacer argument as a function you can modify the object and space parameter helps you to give extra space before every key value pair.

const replacer = (key, value) => {
        // Filtering out properties
        if (typeof value === 'number') {
            return 1;
        }
        return value;
    },

    foo = {
        country: 'India',
        state: 'Gujarat',
        district: 45,
        cm: 'car',
        am: 7
    },

    result = JSON.stringify(foo, replacer);

console.log(result) // {"country":"India","state":"Gujarat","district":1,"cm":"car","am":1}

Space argument -

const obj = { a : 1, b:2};

const obj_str = JSON.stringify(obj, null, '     ');// '\t' gives one tab 

console.log(obj_str)

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