If your object is like

const obj = { name: "John", age: 30, city: "New York" };

Use the JavaScript function JSON.stringify() to convert it into a string. Like this JSON.stringify(obj). then you will get this string:

"{"name":"John","age":30,"city":"New York"}"

Actually, the best solution is using JSON:

Documentation

JSON.parse(text[, reviver]);

Examples:

1)

var myobj = JSON.parse('{ "hello":"world" }');
alert(myobj.hello); // 'world'

2)

var myobj = JSON.parse(JSON.stringify({
    hello: "world"
});
alert(myobj.hello); // 'world'

3) Passing a function to JSON

var obj = {
    hello: "World",
    sayHello: (function() {
        console.log("I say Hello!");
    }).toString()
};
var myobj = JSON.parse(JSON.stringify(obj));
myobj.sayHello = new Function("return ("+myobj.sayHello+")")();
myobj.sayHello();

I would recommend using JSON.stringify, which converts the set of the variables in the object to a JSON string.

var obj = {
  name: 'myObj'
};

JSON.stringify(obj);

Most modern browsers support this method natively, but for those that don't, you can include a JS version.