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Number Validation in JavaScript
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JavaScript – Validate URL in JS

Last Updated : 16 Jan, 2025
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We will explore different approaches to validating URLs in JavaScript. These approaches include using regular expressions (regex), the URL constructor, and various npm packages. let’s see one by one.

All valid URLs follow a particular pattern. They have three main parts, which are:

  • Protocol
  • Domain name (or IP address)
  • Port and path.

1. Using Regular Expression

To validate a URL in JavaScript using a regular expression (regex), we will use the following pattern to match the common URL format in the below example.

JavaScript 
function isValid(url) {     const pattern = /^(https?:\/\/)?([\w-]+\.)+[\w-]+(\/[\w-]*)*$/;     return pattern.test(url); }  //Driver Code Starts{ console.log(isValid("https://www.example.com")); console.log(isValid("http://example.com"));   console.log(isValid("www.example.com"));    console.log(isValid("invalid-url"));      //Driver Code Ends }

Output
true true true false

Explanation of the Regular Expression we used:

  • ^(https?:\/\/)?: Matches an optional http:// or https://.
  • ([\da-z.-]+): Matches the domain name (alphanumeric characters, dots, and hyphens).
  • \.: Matches the dot before the domain extension.
  • ([a-z.]{2,6}): Matches the domain extension (For ex., .com, .org).
  • ([\/\w .-]*)*\/?: Matches the optional path, query strings, or fragments.

2. Using URL Object

The URL object in JavaScript provides a built-in way to parse and validate URLs. It is robust, handles complex cases, and doesn’t require writing or maintaining custom regular expressions.

JavaScript 
function isValid(url) {     try {         new URL(url);         return true;     } catch (e) {         return false;     } }   //Driver Code Starts{ console.log(isValid("https://www.example.com"));  console.log(isValid("http://example.com"));      console.log(isValid("www.example.com"));       console.log(isValid("invalid-url"));          //Driver Code Ends }

Output
true true false false

3. Using npm Packages

There are two npm packages is-url and is-url-http to validate URL. Install the packages with the following command:

npm install is-url
npm install is-url-http

Using is-url npm Packages

JavaScript 
import isUrl from 'is-url'; console.log(isUrl("https://www.example.com"));  console.log(isUrl("http://example.com"));    console.log(isUrl("www.example.com"));        console.log(isUrl("invalid-url"));

Output

true
true
false
false

4. Using is-url-http npm Packages

JavaScript 
import isUrlHttp from 'is-url-http'; console.log(isUrlHttp("https://www.example.com")); console.log(isUrlHttp("http://example.com"));    console.log(isUrlHttp("www.example.com"));      console.log(isUrlHttp("invalid-url"));

Output

true
true
false
false


Next Article
Number Validation in JavaScript

P
PranchalKatiyar
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Article Tags :
  • JavaScript
  • Web Technologies
  • JavaScript-RegExp

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