# isurl [![NPM Version][npm-image]][npm-url] ![File Size][filesize-image] [![Build Status][travis-image]][travis-url] [![Dependency Monitor][greenkeeper-image]][greenkeeper-url] > Determines whether a value is a WHATWG [`URL`](https://mdn.io/URL). Works cross-realm/iframe and despite `Symbol.toStringTag`. ## Installation [Node.js](https://nodejs.org) `>= 8` is required. To install, type this at the command line: ```shell npm install isurl ``` ## Usage ```js 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): ```js const url = new URL('http://domain/?query'); console.log(url.searchParams); //-> undefined isURL.lenient(url); //-> true ``` [npm-image]: https://img.shields.io/npm/v/isurl.svg [npm-url]: https://npmjs.com/package/isurl [filesize-image]: https://img.shields.io/badge/bundle-3.1kB%20gzipped-blue.svg [travis-image]: https://img.shields.io/travis/stevenvachon/isurl.svg [travis-url]: https://travis-ci.org/stevenvachon/isurl [greenkeeper-image]: https://badges.greenkeeper.io/stevenvachon/isurl.svg [greenkeeper-url]: https://greenkeeper.io/
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