isExternal

isExternal(href) returns true when the URL isn't under window.location.origin. It compares href + '/' against origin + '/', so it guards against example.net matching example.net.ha.com. Part of pota/use/url.

The check is a plain string prefix on the href as given: a relative string (/about) doesn't carry the origin, so it tests external. Feed it fully-qualified URLs — for example an anchor's href property, which the browser resolves.

Arguments

Argument	Type	Description
href	string	The URL to check.

Returns: boolean — true when href is not under the current origin.

Examples

Classify links against the current origin

Fully-qualified URLs compare against the origin; relative strings test external — resolve them first.

import { isExternal } from 'pota/use/url'

// with origin https://pota.quack.uy
isExternal('https://pota.quack.uy/use/url') // false
isExternal('https://example.net/') // true
isExternal('/use/url') // true — no origin prefix; resolve first