ES6 URI class that can be used with anything resembling an URL.

URI.js

const cache = {};

export default class URI
{
  constructor(url){
    this.url = url
    this.parts = {}
  }
  parse(){
    if(this.url in cache){
      this.parts = cache[this.url]
    }
    else{
        const parser = /(\w+)(?:\:\/\/)((?:[\w]+\:[\w]+(?:\@)){0,})([\w\.\:]+)(?:\/)([\w]+)?(?:\?)?([\w\=\%\&\-]+)?(?:\#)?([\w]+)?/gm
        const [,proto, auth, host, path, qs, fragment] = this.url.split(parser)
        const parts = {
          proto, auth, host, path, qs, fragment 
        }
        this.parts = cache[this.url] = parts
    }

    return this;
  }
  getPart(part){
    if(!Object.keys(this.parts).length){ throw new Error("Unparsed URL.") }
    return this.parts[part] || "";
  }
  get proto(){
	return this.getPart("proto")
  }
  get auth(){
	return this.getPart("auth").slice(0,-1);
  }
  get host(){
	return this.getPart("host")
  }
  get path(){
    return this.getPart("path")
  }
  get queryString(){
    const myQS = this.getPart("qs")
    const qs = new URLSearchParams(myQS)
    return [...qs.entries()].reduce((all, [name,value])=>{
      all[name] = value
      return all
    },{});
  }
  get fragment(){
    return this.getPart("fragment");
  } 
}