JSFiddle
jsfiddle.net
JSFiddle - Code Playground
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle.
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Moment JS playground.
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle.
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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
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.
Videos
JavaScript Unit Testing Tutorial for Beginners
16:57
Beginner’s Guide to JavaScript Testing and its Best Practices ...
18:29
30 Testing and Debugging JavaScript Code: Complete Guide for ...
JavaScript Mock Interview 2025 - Live Coding
01:52:53
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14:35
Live Coding Interview JavaScript (Senior Level - Recursion) - YouTube
Is PlayCode's JavaScript compiler free?
Yes, PlayCode's JavaScript compiler is completely free to use. You can compile and run unlimited JavaScript code, use npm packages, and see live preview results without paying anything. Pro features like AI assistance and private projects are available for subscribers.
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
Linangdata
linangdata.com › javascript-tester
Javascript Tester
July 8, 2022 - Javascript tester - online javascript tester for editing and testing your javascript code snippets
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.
Isograd-testingservices
isograd-testingservices.com › EN › javascript-pre-employment-test
Free online JavaScript test | Isograd Testing Services
Free JavaScript test and online pre-employment test. JavaScript coding skills assessment.
Address 329 NE Couch Street, Portland, OR 97232, USA
OneCompiler
onecompiler.com › javascript › 3yyjvyt9b
test-code-js - JavaScript - OneCompiler
The editor shows sample boilerplate code when you choose language as Javascript and start coding.
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.
Top answer 1 of 3
41
Following is a free list of tools you can use to check, test and verify your JS code:
- Google Code Playground
- JavaScript Sandbox
- jsbin
- jsfiddle
- pastebin
- jsdo.it
- firebug
- html5snippet.net
Hope this helps.
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If you want to edit some complex javascript I suggest you use JsFiddle. Alternatively, for smaller pieces of javascript you can just run it through your browser URL bar, here's an example:
javascript:alert("hello world");
And, as it was already suggested both Firebug and Chrome developer tools have Javascript console, in which you can type in your javascript to execute. So do Internet Explorer 8+, Opera, Safari and potentially other modern browsers.
Code Beautify
codebeautify.org › javascript-tester
Javascript Tester to test Javascript code online with Console
A JavaScript tester is a tool or platform that allows you to run and test JavaScript code. It can help debug and verify that your code is working as expected.
MDN Web Docs
developer.mozilla.org › en-US › docs › Learn_web_development › Core › Scripting › Test_your_skills
Test your skills: JavaScript - 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.
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.
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.
CoderPad
coderpad.io › online-coding-tests › javascript
Online JavaScript Coding Test - 15+ questions to screen candidates
January 5, 2024 - We offer your team JavaScript coding tests that are both realistic and practical, providing an accurate evaluation of candidates’ JavaScript skills. With tools like CoderPad Screen, you can create JavaScript coding tests in just one minute, even if you don’t have a technical background.
TestDome
testdome.com › tests › javascript-online-test › 14
JavaScript Online Test | TestDome
The JavaScript online test assesses knowledge of programming in the JavaScript language and core front-end web development concepts. This test contains a series of live coding tasks that are executed inside the Google Chrome web browser.
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.
Mailosaur
mailosaur.com › blog › best-tools-for-testing-javascript-code
Best tools for testing Javascript code | Mailosaur
Learn about JavaScript testing with tools like Mocha, Chai, Jest, and Cypress. Understand testing in agile development, discover types of tests and much more.
CodeBurst
codeburst.io › testing-your-javascript-code-95c171c71647
Testing your JavaScript Code. I know what you might be thinking… | by Johann Schuster | codeburst
December 3, 2017 - Writing tests for our functions avoid these simple yet expensive mistakes that could happen, and as your app grows, the expense of faulty code increases. This article will give you a simple overview of testing your JavaScript code and what you can expect your code to look like when implementing tests.
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
LambdaTest
lambdatest.com › home › blog › best 13 tools to test javascript code
Best 13 Tools To Test JavaScript Code | LambdaTest
October 31, 2023 - Unit and functional testing are the prime ways of verifying the JavaScript code quality. However, a host of tools are available that can also check code before or during its execution in order to test its quality and adherence to coding standards.
DevSkiller
devskiller.com › home › coding tests › javascript
JavaScript (js) Coding / Programming Test Interview Questions
Screen out the best JavaScript developers with DevSkiller JavaScript coding interview questions and tests powered by RealLifeTesting™.