How to Turn an Object into Query String Parameters in JavaScript

ObjectToUrlParams.js

// ES6
var queryString = Object.keys(params).map(key => key + '=' + params[key]).join('&');
const queryString = Object.keys(params).map(function(key) {
    return key + '=' + params[key]
}).join('&');

// ES5
var queryString = Object.keys(params).map(function(key) {
    return key + '=' + params[key]
}).join('&');