locutus/esm/golang/url/QueryUnescape.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

export function QueryUnescape(s) {
    //      discuss at: https://locutus.io/golang/url/QueryUnescape
    // parity verified: Go 1.23
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Decodes query-escaped strings where `+` maps to a space.
    //       example 1: QueryUnescape('a+b%2Bc')
    //       returns 1: 'a b+c'
    //       example 2: QueryUnescape('https%3A%2F%2Flocutus.io%2F%3Fq%3Dgo+lang')
    //       returns 2: 'https://locutus.io/?q=go lang'
    //       example 3: QueryUnescape('%2Bplus')
    //       returns 3: '+plus'
    const raw = String(s).replace(/\+/g, ' ');
    try {
        return decodeURIComponent(raw);
    }
    catch {
        throw new TypeError('QueryUnescape(): invalid query escape');
    }
}