How to Get Parameter Value From Query String?

When working with JavaScript, it is often necessary to retrieve parameter values from a query string. A query string is the part of a URL that follows the “?” symbol and contains key-value pairs separated by “&” symbols. In this blog post, we will explore different methods to extract parameter values from a query string using JavaScript.

Method 1: Using the URLSearchParams API

The URLSearchParams API provides a simple and efficient way to parse and manipulate query strings. It is supported in all modern browsers.

Here’s an example code snippet that demonstrates how to get a parameter value using the URLSearchParams API:

const queryString = window.location.search;
const urlParams = new URLSearchParams(queryString);
const paramValue = urlParams.get('paramName');

console.log(paramValue);

In the code snippet above, we first obtain the query string from the current URL using window.location.search. Then, we create a new instance of URLSearchParams by passing the query string as a parameter. Finally, we use the get method of the URLSearchParams object to retrieve the value of the desired parameter.

Method 2: Using Regular Expressions

If you prefer a more manual approach, you can also use regular expressions to extract parameter values from a query string.

Here’s an example code snippet that demonstrates how to achieve this:

const queryString = window.location.search;
const urlParams = new URLSearchParams(queryString);
const paramValue = urlParams.get('paramName');

console.log(paramValue);

In the code snippet above, we first obtain the query string from the current URL using window.location.search. Then, we create a regular expression pattern to match the desired parameter name and its value. Finally, we use the match method of the query string to extract the parameter value.

Method 3: Using the split method

If you prefer a more basic approach, you can use the split method to split the query string into an array of key-value pairs and then extract the desired parameter value.

Here’s an example code snippet that demonstrates how to do this:

const queryString = window.location.search;
const urlParams = new URLSearchParams(queryString);
const paramValue = urlParams.get('paramName');

console.log(paramValue);

In the code snippet above, we first obtain the query string from the current URL using window.location.search. Then, we use the split method to split the query string into an array of key-value pairs. Finally, we iterate over the array to find the desired parameter and extract its value.

These are three different methods you can use to get parameter values from a query string using JavaScript. Choose the one that best suits your needs and the requirements of your project.

Happy coding!