How do you get the query string values of the current page in JavaScript?

TL;DR

To get the query string values of the current page in JavaScript, you can use the URLSearchParams object. First, create a URLSearchParams instance with window.location.search, then use the get method to retrieve specific query parameters. For example:

const params = new URLSearchParams(window.location.search);
const value = params.get('key');

This will give you the value of the query parameter named key.

How do you get the query string values of the current page in JavaScript?

Using URLSearchParams

The URLSearchParams interface provides an easy way to work with query strings. Here's how you can use it:

1. Create a URLSearchParams instance: Use window.location.search to get the query string part of the URL.
2. Retrieve specific query parameters: Use the get method to get the value of a specific query parameter.

const params = new URLSearchParams(window.location.search);
const value = params.get('key'); // Replace 'key' with the actual query parameter name

Example

Consider a URL like https://example.com?page=2&sort=asc. To get the values of page and sort:

const params = new URLSearchParams(window.location.search);
const page = params.get('page'); // '2'
const sort = params.get('sort'); // 'asc'

Handling multiple values

If a query parameter appears multiple times, you can use the getAll method to retrieve all values:

const params = new URLSearchParams(window.location.search);
const values = params.getAll('key'); // Returns an array of values

Checking for the existence of a parameter

You can use the has method to check if a query parameter exists:

const params = new URLSearchParams(window.location.search);
const hasPage = params.has('page'); // true or false

Iterating over all parameters

You can iterate over all query parameters using the forEach method:

const params = new URLSearchParams(window.location.search);
params.forEach((value, key) => {
  console.log(`${key}: ${value}`);
});

Further reading

• MDN Web Docs: URLSearchParams
• MDN Web Docs: window.location