How to convert an object to string using JavaScript ?

To convert an object to string using JavaScript we can use the available methods like string constructor, concatenation operator etc.

Let’s first create a JavaScript object.

Javascript

// Input object
let obj_to_str = {
    name: "GeeksForGeeks",
    city: "Noida",
    contact: 2488
};

Examples to convert an object to string using JavaScript

1. Using String() Constructor

String() constructor converts the value of an object to a string. 

Syntax:

String(object)

Example: Here, we will use the string() method to convert the objects to a string.

javascript

// Inputs
let bool_to_s1 = Boolean(0);
let bool_to_s2 = Boolean(1);
let num_to_s = 1234;

// Display type of first input
console.log( typeof(bool_to_s1));

// After converting to string
console.log( typeof(String(bool_to_s1)));

// Display type of first input
console.log( typeof(bool_to_s2));

// After converting to string
console.log(typeof(String(bool_to_s2)));

// Display type of first input
console.log( typeof(num_to_s));

// After converting to string
console.log(typeof(String(num_to_s)));

Output

boolean
string
boolean
string
number
string

Explanation: This code demonstrates type conversion in JavaScript. It first creates a boolean value from 0 and 1, and then converts them to strings using the String() constructor. Similarly, it converts a number to a string. Finally, it logs the types before and after conversion for each case.

2. Using JSON.stringify() Method

JSON.stringify() converts the JavaScript object to a string which is needed to send data over the web server. 

Syntax:

JSON.stringify(obj)

Example: In this example, we will use JSON.stringify() method for conversion of an object to a string.

javascript

// Input object
let obj_to_str = {
    name: "GeeksForGeeks",
    city: "Noida",
    contact: 2488
};

// Converion to string
let myJSON = JSON.stringify(obj_to_str);

// Display output
console.log(myJSON);

Output

{"name":"GeeksForGeeks","city":"Noida","contact":2488}

Explanation: This code converts the object obj_to_str to a JSON string using JSON.stringify(). It then logs the resulting JSON string to the console. This process serializes the object’s properties into a string representation suitable for data interchange.

Using plus (+) Operator with string

By default concatenation operation of a string with any data type value first, and convert the value to string type then concatenate it to string. 

Syntax:

"" + object ;

Example: Here, we are using + operate to change objects to strings.

Javascript

// Input objects
let obj1 = new Object();
let obj2 = { ww : 99 , ss : 22};

// Display type of objects before
// and after their conversion
console.log( typeof( obj1 ));
console.log( typeof( '' + obj1));
console.log( typeof( obj2 ));
console.log(typeof( '' + obj2 ));

Output

object
string
object
string

Explanation: The code demonstrates converting objects to strings in JavaScript. It creates two objects, obj1 and obj2, and displays their data types before and after conversion. By concatenating an empty string, the objects are converted to strings, changing their data types from object to string.