JSFiddle - React, Tailwind, and code Playground

JavaScript

function hashCode (str){
    var hash = 0;
    if (str.length == 0) return hash;
    for (i = 0; i < str.length; i++) {
        char = str.charCodeAt(i);
        hash = ((hash<<5)-hash)+char;
        hash = hash & hash; // Convert to 32bit integer
    }
    return hash;
}
var str = "cloud_adm_dictionary_type%5Bitems%5D%5B0%5D%5BdictName%5D=w%C5%82asnee&cloud_adm_dictionary_type%5Bitems%5D%5B0%5D%5BdictActive%5D=1&cloud_adm_dictionary_type%5Bitems%5D%5B1%5D%5BdictName%5D=proklienckii&cloud_adm_dictionary_type%5Bitems%5D%5B1%5D%5BdictActive%5D=1&cloud_adm_dictionary_type%5Bitems%5D%5B2%5D%5BdictName%5D=telemarketing&cloud_adm_dictionary_type%5Bitems%5D%5B2%5D%5BdictActive%5D=1&cloud_adm_dictionary_type%5Bitems%5D%5B3%5D%5BdictName%5D=mailing&cloud_adm_dictionary_type%5Bitems%5D%5B3%5D%5BdictActive%5D=1&cloud_adm_dictionary_type%5Bitems%5D%5B4%5D%5BdictName%5D=www&cloud_adm_dictionary_type%5Bitems%5D%5B4%5D%5BdictActive%5D=1&cloud_adm_dictionary_type%5Bitems%5D%5B5%5D%5BdictName%5D=partner&cloud_adm_dictionary_type%5Bitems%5D%5B5%5D%5BdictActive%5D=1&cloud_adm_dictionary_type%5Bitems%5D%5B6%5D%5BdictName%5D=nowe+zrodlo&cloud_adm_dictionary_type%5Bitems%5D%5B6%5D%5BdictActive%5D=1&cloud_adm_dictionary_type%5Bitems%5D%5B7%5D%5BdictName%5D=Aaa&cloud_adm_dictionary_type%5Bitems%5D%5B7%5D%5BdictActive%5D=1&cloud_adm_dictionary_type%5B_token%5D=3PBJr_pPjHhAIB95N7PUReP5asrXsGwCILAxZLyGTUg"
alert(hashCode(str));