JSFiddle
jsfiddle.net
JSFiddle - Code Playground
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle.
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Edit fiddle
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle.
React - JSFiddle
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle.
TypeScript
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle.
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
W3Schools
w3schools.com › js › js_editor.asp
JavaScript Online Editor
With our online JavaScript editor, you can edit HTML, CSS and JavaScript code, and view the result in your browser.
Is there a way to test my js code without setting up an html?
In vscode, you can “run” (on my machine, you use F5) the code and the output will appear in the terminal. You can also just write “node yourFile.js” in the terminal either in vscode or in bash, and Bob is your mother’s brother. More on reddit.com
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June 6, 2021Free online tool to test out javascript?
Codepen, jsfiddle and the browser itself More on reddit.com
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March 5, 2025Is PlayCode's JavaScript compiler free?
Yes, PlayCode's JavaScript compiler online is completely free to use. You can compile and run unlimited JavaScript online, use npm packages, and see live preview results without paying anything. Run JavaScript online for free with instant compilation. Pro features like AI assistance and private projects are available for subscribers.
playcode.io
playcode.io › javascript-compiler
JavaScript Compiler Online - Run JS Code Free | PlayCode
What is a JavaScript compiler?
A JavaScript compiler transforms your JavaScript code into optimized, executable code. Unlike traditional compilers that produce machine code, online JavaScript compilers and editors like PlayCode bundle your code, resolve imports, and transpile modern syntax (ES2026, TypeScript, JSX) into browser-compatible JavaScript that runs instantly. You can compile and edit JavaScript online with zero setup using our JavaScript editor.
playcode.io
playcode.io › javascript-compiler
JavaScript Compiler Online - Run JS Code Free | PlayCode
Does the JavaScript compiler work offline?
Yes, you can run JavaScript online even offline once the page is loaded. The compiler runs entirely in your browser using WebAssembly, so you can keep coding and compile JavaScript without an internet connection. Your code is saved locally and syncs when you're back online.
playcode.io
playcode.io › javascript-compiler
JavaScript Compiler Online - Run JS Code Free | PlayCode
Videos
Can you test JavaScript without a build step!?!
16:57
Beginner’s Guide to JavaScript Testing and its Best Practices ...
JavaScript Unit Testing Tutorial for Beginners
01:19
How to Test a JavaScript Snippet Using Chrome DevTools - YouTube
02:06
How To Test JavaScript Visual Studio Code Tutorial - YouTube
07:35
Episode 90 - JavaScript Testing - YouTube
Linangdata
linangdata.com › javascript-tester
Javascript Tester
July 8, 2022 - Javascript tester - online javascript tester for editing and testing your javascript code snippets
Playcode
playcode.io › javascript-compiler
JavaScript Compiler Online - Run JS Code Free | PlayCode
JavaScript compiler online to run JavaScript online instantly in your browser. Use AI to generate code, fix bugs, and explain errors. TypeScript, JSX, and npm packages supported. Free, no signup required.
Reddit
reddit.com › r/learnjavascript › is there a way to test my js code without setting up an html?
r/learnjavascript on Reddit: Is there a way to test my js code without setting up an html?
June 6, 2021 -
Sorry for asking this I suposse this gets asked a lot here but I could not find any info on the matter.
I am learning js for web developing but I already know python. I have been learning for 2 days and today I started js codewars.
Everytime I want to set up an exercise I have to create an html file, link the file to the html, launch the html in the browser, write the code in the js file, open the console on firefox and check if my function has the correct output (I use console.log to check)
It gets old real quick when you have to do that 10 times a day. In python I would just click "run" and that's it.
Is there anyway to check the output on vs code without having to set up the whole thing?
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In vscode, you can “run” (on my machine, you use F5) the code and the output will appear in the terminal. You can also just write “node yourFile.js” in the terminal either in vscode or in bash, and Bob is your mother’s brother.
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Repl.it If you install node js on your computer you can just run node file name.js and it will run. If you’re trying to also modify html files I believe code sandbox allows you to have index.html / css/ js file all in the browser
Jshint
jshint.com
JSHint, a JavaScript Code Quality Tool
JSHint, a JavaScript Code Quality Tool
TypeScript
typescriptlang.org › play
TypeScript: TS Playground - An online editor for exploring TypeScript and JavaScript
The Playground lets you write TypeScript or JavaScript online in a safe and sharable way.
Jest
jestjs.io
Jest · 🃏 Delightful JavaScript Testing
Tests fail—when they do, Jest provides rich context why. Here are some examples: Jest is a JavaScript testing framework designed to ensure correctness of any JavaScript codebase.
RunJS
runjs.app › play
Online JavaScript Playground
An easy-to-use online JavaScript playground with live feedback. Write and run JavaScript instantly. Great for learning and prototyping.
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.
Playcode
playcode.io
PlayCode - AI Website Builder
Conduct technical interviews online. Share link, candidate codes instantly. ReactVue · JSON FormatterJSON to TypeScriptRegex TesterJSON Diff · JavaScript Playground · FreePopular · Write, run, and share JavaScript code instantly. Free & no signup. JavaScript Compiler ·
OneCompiler
onecompiler.com › javascript
JavaScript Online Compiler & Interpreter
OneCompiler's JavaScript online editor helps you to write, compile, debug and run JavaScript code online
Visual Studio Code
code.visualstudio.com › docs › languages › javascript
JavaScript in Visual Studio Code
November 3, 2021 - For a more in-depth guide on how these features work and can be configured, see Working with JavaScript. IntelliSense shows you intelligent code completion, hover information, and signature information so that you can write code more quickly and correctly.
Liveweave
liveweave.com
Liveweave - Generative AI Code Editor & HTML, CSS, JS Playground
Liveweave is a generative AI-powered code editor for HTML, CSS, and JavaScript. Generate code instantly with AI, prototype web designs, and test front-end code in real-time.
Cypress
cypress.io
Testing Frameworks for Javascript | Write, Run, Debug | Cypress
Generate tests faster than ever with Cypress Studio. Record interactions, get smart AI recommendations, or describe flows in natural language. Watch Cypress instantly turn plain English into runnable test code.Learn more
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!
Testmuai
testmuai.com › testmu ai › blog › best 13 tools to test javascript code | testmu ai
Best 13 Tools To Test JavaScript Code | TestMu AI (Formerly LambdaTest)
January 30, 2026 - The top 13 most popular tools to test JavaScript code in a browser are – ... TestMu AI is a leading continuous quality cloud that allows developers and testers to test the compatibility of their websites and mobile applications across on-demand ...
Code Beautify
codebeautify.org › javascript-tester
Javascript Tester to test Javascript code online with Console
Javascript Tester to test javascript code online to get console results
CodePen
codepen.io
CodePen: Online Code Editor and Front End Web Developer Community
Build, share, and learn JavaScript, CSS, and HTML with our online code editor.
Programiz
programiz.com › javascript › online-compiler
Online JavaScript Compiler (Editor) - Programiz
// Online Javascript Editor for free // Write, Edit and Run your Javascript code using JS Online Compiler console.log("Try programiz.pro");