Get Query Parameters From a URL in JavaScript

URL parameters (also called query string parameters or URL variables) are used to send small amounts of data from page to page, or from client to server via a URL. They can contain all kinds of useful information, such as search queries, link referrals, product information, user preferences, and more.

In this tutorial, we are going to learn how to access the query parameters from a URL using JavaScript.

Query parameters are added at the end of a URL using question mark ? followed by the key=value pairs.

Example:

localhost:3000/?name=sai

To access the query parameters of a URL inside the browser, using JavaScript, we can use the URLSeachParams interface that contains a get() method to work with it.

Here is an example:

Url:

localhost:3000/?name=sai

You can get the value of a name parameter from the above url like this:

  // window.location.search = ?name=sai

  const params = new URLSearchParams(window.location.search);

  const name = params.get("name");

  console.log(name); // "sai"
                

If you have multiple parameters in a URL which is passed using & operator:

localhost:3000/?name=sai&score=10

You can access it like this:

  // window.location.search = ?name=sai&score=10
  const params = new URLSearchParams(window.location.search);

  const name = params.get("name");
  const name = params.get("score");

  console.log(name); // "sai"
  console.log(score); // 10
                

You can also check, if a URL contains specified parameters or not by using the has() method.

The has() method returns boolean value true if a parameter name exists; otherwise it returns false.

  params.has("name"); // true

  params.has("place"); // false