Web Toolkit Online
webtoolkitonline.com › javascript-tester.html
JavaScript Tester online
Run and test your JavaScript code securely with our 100% local online tool. No data is sent over the Internet – everything runs in your browser! Fast, simple, and secure.
Factsheet
Available in English
Founder(s) Oskar Krawczyk, Piotr Zalewa
URL jsfiddle.net
Available in English
Founder(s) Oskar Krawczyk, Piotr Zalewa
URL jsfiddle.net
JSFiddle
jsfiddle.net
JSFiddle - Code Playground
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle.
Playcode
playcode.io › javascript-compiler
JavaScript Compiler - AI-Powered JS Compiler Online | Free
PlayCode lets you run JavaScript online without any setup. Just open your browser, write your code, and execute it instantly. No need to install Node.js, configure webpack, or set up a development environment. Our online JS editor supports ES2026, TypeScript, JSX, and TSX right out of the box.
How fast is the online JavaScript compiler?
PlayCode's compiler is optimized for speed. Initial compilation takes 100-500ms depending on project size. Incremental builds (when you edit code) complete in 20-50ms. That's often faster than running a local Node.js bundler because everything runs in memory with no disk I/O.
playcode.io
playcode.io › javascript-compiler
JavaScript Compiler - AI-Powered JS Compiler Online | Free
What is a JavaScript compiler?
A JavaScript compiler transforms your JavaScript code into optimized, executable code. Unlike traditional compilers that produce machine code, JS compilers like PlayCode bundle your code, resolve imports, and transpile modern syntax (ES2026, TypeScript, JSX) into browser-compatible JavaScript that runs instantly.
playcode.io
playcode.io › javascript-compiler
JavaScript Compiler - AI-Powered JS Compiler Online | Free
Does the JavaScript compiler work offline?
PlayCode works offline once loaded. The compiler runs entirely in your browser using WebAssembly, so you can keep coding without an internet connection. Your code is saved locally and syncs when you're back online.
playcode.io
playcode.io › javascript-compiler
JavaScript Compiler - AI-Powered JS Compiler Online | Free
BrowserStack
browserstack.com › home › guide › how to test javascript in browsers (with 5 methods)
How to test JavaScript in Browsers (with 5 Methods) | BrowserStack
March 28, 2025 - Learn to test JavaScript code in browsers with effective online tools such as JSFiddle, BrowserStack, CodePen, JSBin, & Liveweave.
TestDome
testdome.com › tests › javascript-online-test › 14
JavaScript Online Test | TestDome
Practice your skills and earn a ... people. ... The JavaScript online test assesses knowledge of programming in the JavaScript language and core front-end web development concepts....
Playcode
playcode.io
JavaScript Playground - Free Online JS Sandbox
PlayCode is the #1 JavaScript Playground trusted by millions of developers worldwide. Write, run, and test your JavaScript code instantly in your browser, no setup, no installation required.
RunJS
runjs.app › play
RunJS - JavaScript Playground | Run JavaScript Online
An easy-to-use online JavaScript playground with live feedback. Write and run JavaScript instantly. Great for learning and prototyping.
Linangdata
linangdata.com › javascript-tester
Javascript Tester
July 8, 2022 - Javascript tester - online javascript tester for editing and testing your javascript code snippets. Use the javascript tester to quickly test your javascript functions and code.
OneCompiler
onecompiler.com › javascript
JavaScript Online Compiler & Interpreter
OneCompiler's JavaScript online editor helps you to write, compile, debug and run JavaScript code online
TestDome
testdome.com › tests › javascript-node-js-online-test › 111
JavaScript and Node.js Online Test | TestDome
The JavaScript and Node.js online test assesses knowledge of JavaScript and the Node.js environment, including solving live coding problems.
Jest
jestjs.io
Jest · 🃏 Delightful JavaScript Testing
Jest aims to work out of the box, config free, on most JavaScript projects. Make tests which keep track of large objects with ease.
Code Beautify
codebeautify.org › javascript-tester
Javascript Tester to test Javascript code online with Console
Javascript Code Tester helps to test your Javascript and shows console output as results. JS Tester allows loading the Javascript Source Code URL to Test. Use your JS URL to format.
Reddit
reddit.com › r/learnjavascript › free online tool to test out javascript?
r/learnjavascript on Reddit: Free online tool to test out javascript?
March 5, 2025 -
Hi guys
I'm looking for a free online tool where I can practice HTML, CSS and Javascript. I prefer something with an console included so that I can see my error messages right away. playcode.io is pretty great, but requires a subscribtion if you write more than a certain amount of code. Do you known of other similar solutions where I can see the console as well? I've been using https://onecompiler.com/ which lacks the console : (
Thanks!
LambdaTest
lambdatest.com › home › free tools › javascript tester
JavaScript Tester Online Code Complier - JS Playground
Test and debug your JavaScript code instantly with our free tool. Get real-time feedback and fix errors with ease, no installation is required.
W3Schools
w3schools.com › js › js_quiz.asp
JavaScript Quiz Test
You can test your JavaScript skills with W3Schools' Quiz.
TutorialsTeacher
tutorialsteacher.com › online-test › javascript-test
Online JavaScript Test
Free online JavaScript test. Check how much you know about JavaScript with our free online JavaScript test. This online JavaScript test includes questions related to JavaScript elements, methods, animation, DOM traversing, event, ajax etc.
CodeChef
codechef.com › skill-test › javascript
JavaScript Online Test & Quiz
Take this JavaScript Online Test & Quiz to verify your practical knowledge and prepare for industry. Get instant recommendation on what concepts to learn after you finish the test. The test will have around 30 problems and will finish in 2 hours.
W3Schools
w3schools.com › js › js_editor.asp
JavaScript Online Editor
Practice is key to mastering coding, and the best way to put your JavaScript knowledge into practice is by getting practical with code. Use W3Schools Spaces to build, test and deploy code.
GreenMest
greenmesg.org › online_tools › javascript_tester.php
Javascript Tester
Test Javascript code online. Input Data: (<textarea id="inputData"></textarea>) (e.g to simulate data received from AJAX call): Javascript: (you can use the inputData & output div and paste js functions): Test Output: (<div id="output"></div>):
MDN Web Docs
developer.mozilla.org › en-US › docs › Learn_web_development › Core › Scripting › Test_your_skills › Functions
Test your skills: Functions - Learn web development | MDN
The aim of this skill test is to help you assess whether you've understood our Functions — reusable blocks of code, Build your own function, and Function return values articles. Note: To get help, read our Test your skills usage guide. You can also reach out to us using one of our communication channels. Some of the questions below require you to write some DOM manipulation code to complete them — such as creating new HTML elements, setting their text contents to equal specific string values, and nesting them inside existing elements on the page — all via JavaScript.