is-fqdn Check if a string represent a fully qualified domain name. Installation npm install --save is-fqdn Usage const isFQDN = require("is-fqdn"); console.log(isFQDN("www.parro.it"));// true console.log(isFQDN("256.0.0.0"));// false console.log(isFQDN("s!ome.com"));// false License The MIT License (MIT) Copyright (c) 2016 Andrea Parodi