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Posted 4 Aug 2015
Licenced CPOL

JavaScript URL encode, decode and escape

, 4 Aug 2015
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A simple utility that provides JavaScript URL encode, decode and escape functionality

This article may contain live JavaScript that has been reviewed and tested for security. If you wish to submit articles containing JavaScript please email your submissions to


I was sick of having to look up the difference between urlencode, encodeURIComponent and escape, so here's a quick online tool for those who need it.


The Code

<script type="text/javascript">
    function Process() {

        var source = document.getElementById('text');
        var text   = "" + source.value;
        var target = document.getElementById("result");
        var result = "";

        if (document.getElementById('encode').checked === true) {
            result += "<h4>urlEncode</h4><p>" + urlencode(text) + "</p>";
            result += "<h4>encodeURI</h4><p>" + encodeURI(text) + "</p>";
            result += "<h4>encodeURIComponent</h4><p>" + encodeURIComponent(text) + "</p>";
            result += "<h4>escape</h4><p>" + escape(text) + "</p>";
        else {
            result += "<h4>urldecode</h4><p>" + urldecode(text) + "</p>";
            result += "<h4>decodeURI</h4><p>" + decodeURI(text) + "</p>";
            result += "<h4>decodeURIComponent</h4><p>" + decodeURIComponent(text) + "</p>";
            result += "<h4>unescape</h4><p>" + unescape(text) + "</p>";

        target.innerHTML = result;

    function urlencode(text) {
        return encodeURIComponent(text).replace(/!/g,  '%21')
                                       .replace(/'/g,  '%27')
                                       .replace(/\(/g, '%28')
                                       .replace(/\)/g, '%29')
                                       .replace(/\*/g, '%2A')
                                       .replace(/%20/g, '+');
    function urldecode(text) {
        return decodeURIComponent((text + '').replace(/\+/g, '%20'));


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Chris Maunder
Founder CodeProject
Canada Canada
Chris is the Co-founder, Administrator, Architect, Chief Editor and Shameless Hack who wrote and runs The Code Project. He's been programming since 1988 while pretending to be, in various guises, an astrophysicist, mathematician, physicist, hydrologist, geomorphologist, defence intelligence researcher and then, when all that got a bit rough on the nerves, a web developer. He is a Microsoft Visual C++ MVP both globally and for Canada locally.

His programming experience includes C/C++, C#, SQL, MFC, ASP, ASP.NET, and far, far too much FORTRAN. He has worked on PocketPCs, AIX mainframes, Sun workstations, and a CRAY YMP C90 behemoth but finds notebooks take up less desk space.

He dodges, he weaves, and he never gets enough sleep. He is kind to small animals.

Chris was born and bred in Australia but splits his time between Toronto and Melbourne, depending on the weather. For relaxation he is into road cycling, snowboarding, rock climbing, and storm chasing.

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Comments and Discussions

GeneralUseful Pin
DrABELL4-Aug-15 11:51
professionalDrABELL4-Aug-15 11:51 

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