Determines whether a value is a WHATWG URL.

Works cross-realm/iframe and despite Symbol.toStringTag.

Node.js >= 8 is required. To install, type this at the command line:

npm install isurl

const isURL = require('isurl'); isURL('http://domain/'); //-> false isURL(new URL('http://domain/')); //-> true

Optionally, acceptance can be extended to incomplete URL implementations that lack origin, searchParams and toJSON properties (which are common in many modern web browsers):

const url = new URL('http://domain/?query'); console.log(url.searchParams); //-> undefined isURL.lenient(url); //-> true