javascript object to query string

Converting JavaScript Object to Query String

Have you ever needed to pass JavaScript object data as a query string in the URL? You can do this by converting the object to a query string format. In this article, we will explore how to convert a JavaScript object to a query string and provide multiple ways of doing it.

Method 1: Using jQuery's $.param()

If you are using jQuery, you can use its built-in method $.param() to convert a JavaScript object to a query string. This method takes an object as an argument and returns a string in a query string format.

let obj = { name: "John", age: 30 };
let queryString = $.param(obj);
console.log(queryString); // "name=John&age=30"

Method 2: Using a Custom Function

If you don't want to use jQuery, you can create a custom function to convert the object to a query string. This function will loop through the object's properties and concatenate them into a string.

function objectToQueryString(obj) {
  let queryString = '';
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      if (queryString.length > 0) {
        queryString += '&';
      queryString += key + '=' + encodeURIComponent(obj[key]);
  return queryString;

let obj = { name: "John", age: 30 };
let queryString = objectToQueryString(obj);
console.log(queryString); // "name=John&age=30"

In this function, we first initialize an empty string to store the query string. Then, we loop through each property of the object and check if it belongs to the object itself (not its prototype). If it does, we add the property name and value to the query string, separated by an equals sign. Before adding it to the string, we also use the encodeURIComponent() function to encode any special characters in the value.

Method 3: Using the URLSearchParams API

If you are using modern browsers, you can use the URLSearchParams API to convert a JavaScript object to a query string. This API provides an easy way to create and manipulate URL search parameters.

let obj = { name: "John", age: 30 };
let urlSearchParams = new URLSearchParams(obj);
let queryString = urlSearchParams.toString();
console.log(queryString); // "name=John&age=30"

In this example, we first create a new URLSearchParams object with the object as an argument. Then we call its toString() method to convert it to a string in query string format.


There are multiple ways to convert a JavaScript object to a query string. You can use jQuery's $.param() method, create a custom function, or use the URLSearchParams API. Choose the one that works best for your situation.

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