Date validation. In this tutorial we are going to discuss, how to validate a URL in JavaScript. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: document.getElementById("demo").innerHTML =, W3Schools is optimized for learning and training. ... PHP - Validate URL. While using W3Schools, you agree to have read and accepted our. Using URL parameters is probably the easiest way of passing variables from one webpage to the other. PHP can validate form input server side, submitted by the user using HTML forms. PHP Form Validation Example * required field. You can try to use URL constructor: if it doesn't throw, the string is a valid URL: function isValidUrl(string) { try { new URL (string); } catch (_) { return false; } return true; } The term 'URL' is defined in RFC 3886 (as URI); it must begin with a scheme name, and the scheme name is not limited to http/https. JavaScript provides a way to validate form's data on the client's computer before sending it to the web server. In this page we have discussed how to validate a phone number (in different format) using JavaScript : JavaScript Form Validation HTML form validation can be done by JavaScript. w3schools.com. Examples might be simplified to improve reading and learning. If not specified, it defaults to undefined. Copy, Paste and Validate. W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. Examples might be simplified to improve reading and basic understanding. First remove all illegal characters from the $url variable, then check if it is a valid URL: