Playcode
playcode.io βΊ javascript-compiler
JavaScript Compiler - AI-Powered JS Compiler Online | Free
1 day ago - 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.
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.
browser - Load local javascript file in chrome for testing? - Stack Overflow
I am trying to test some JavaScript on my local computer using the Chrome browser but Chrome will not load local resources. Is there an easy work around for this? More on stackoverflow.com
How do you unit test javacript on a website?
It sounds like you are after something that will test a page running in the browser, rather than the scripts etc that render the page. Perhaps you mean something other than unit testing. Do you want to test things like the user-interactions, or correct loading of the page? Perhaps more like end-to-end testing? Assuming so, the E2E testing framework I found to be easiest to set up and run is Cypress , which allows tests to examine the page in the browser, and to interact with elements. It even allows you to intercept API calls, so tests can spy on requests, and/or mock and stub responses. That said, there is a bit more work involved to start with. But the setup provides a very good guide with lots of examples. And the documentation is pretty good. If you know tools like Mocha or Chai then the test syntax should be largely familiar. More on reddit.com
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5
October 12, 2023Firefox 4 edges out Chrome in SunSpider test
May the JavaScript speed war continue forever.
More on reddit.com 17
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July 28, 2007Should I test JavaScript In Node.js or a browser
2.0m members in the javascript community. All about the ππππππππππ programming language! More on reddit.com
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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 βΊ javascript-compiler
JavaScript Compiler - AI-Powered JS Compiler Online | Free
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 βΊ 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 βΊ javascript-compiler
JavaScript Compiler - AI-Powered JS Compiler Online | Free
Videos
Reddit
reddit.com βΊ r/learnjavascript βΊ 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?
Top answer 1 of 9
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In vscode, you can βrunβ (on my machine, you use F5) the code and the output will appear in the terminal. You can also just write βnode yourFile.jsβ in the terminal either in vscode or in bash, and Bob is your motherβs 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 youβre trying to also modify html files I believe code sandbox allows you to have index.html / css/ js file all in the browser
BrowserStack
browserstack.com βΊ home βΊ guide βΊ 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.
Codecademy
codecademy.com βΊ article βΊ running-javascript-in-the-browser-console
Running JavaScript in the Browser Console | Codecademy
As we can see, the console provides a quick and convenient way of running any JS code in the browser, whether independent of or directly related to the page content. If any edits are made to the page, the changes are temporary and will be gone upon refreshing, which works great for testing purposes when you donβt want to modify the actual code.
RunJS
runjs.app βΊ 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.
WhatIsMyBrowser.com
whatismybrowser.com βΊ detect βΊ is-javascript-enabled
Is JavaScript enabled? - WhatIsMyBrowser.com
June 26, 2024 - Nearly all websites need Javascript enabled these days, are you sure if you've got it enabled? This website will tell you if you have JavaScript enabled.
W3Schools
w3schools.com βΊ js βΊ js_editor.asp
JavaScript Online Editor
You only need your browser Β· Terminal & Log: debug and troubleshoot your code easily Β· File Navigator: switch between files inside the code 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.
Chrome for Developers
developer.chrome.com βΊ docs βΊ chrome devtools βΊ debug javascript
Debug JavaScript | Chrome DevTools | Chrome for Developers
May 22, 2024 - In addition to viewing console.log() messages, you can also use the Console to evaluate arbitrary JavaScript statements. In terms of debugging, you can use the Console to test out potential fixes for bugs.
Cypress
cypress.io
Testing Frameworks for Javascript | Write, Run, Debug | Cypress
Simplify front-end testing with Cypress' open-source app. Explore our versatile testing frameworks for browser-based applications and components.
Top answer 1 of 16
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If you are trying to just test the functionality of your JavaScript file: create a blank HTML file, add a link to your JS file as you would normally load a JS file from HTML, and open the HTML file in Chrome. Go to the JavaScript console. You'll be able to interact with the functionality of your JS code as usual. You wouldn't need to set up a server for this. If still not clear, here's an example:
<html>
<head>
<script type = "text/javascript" src = "path/to/your/jsfile"></script>
</head>
</html>
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You can use a light weight webserver to serve the file.
For example,
1. install Node
2. install the "http-server" (or similar) package
3. Run the http-server package ( "http-server -c-1") from the folder where the script file is located
4. Load the script from chrome console (run the following script on chrome console
var ele = document.createElement("script");
var scriptPath = "http://localhost:8080/{scriptfilename}.js" //verify the script path
ele.setAttribute("src",scriptPath);
document.head.appendChild(ele)
- The script is now loaded the browser. You can test it from console.
BrowserStack
browserstack.com βΊ home βΊ guide βΊ how to run javascript in chrome browser
How to Run JavaScript in Chrome Browser | BrowserStack
April 4, 2025 - Real-Time Testing: Chromeβs Developer Console allows developers to instantly execute and modify JavaScript code, making it easy to test scripts and see results without reloading the page. However, testing in a single browser isnβt enough to ensure seamless functionality across different environments.
Reddit
reddit.com βΊ r/learnjavascript βΊ how do you unit test javacript on a website?
r/learnjavascript on Reddit: How do you unit test javacript on a website?
October 12, 2023 -
I'm pulling my hair out trying to figure out how to unit test my website's javascript. It seems like most popular tools (ex. Mocha) only work in Node.JS.
Top answer 1 of 7
6
It sounds like you are after something that will test a page running in the browser, rather than the scripts etc that render the page. Perhaps you mean something other than unit testing. Do you want to test things like the user-interactions, or correct loading of the page? Perhaps more like end-to-end testing? Assuming so, the E2E testing framework I found to be easiest to set up and run is Cypress , which allows tests to examine the page in the browser, and to interact with elements. It even allows you to intercept API calls, so tests can spy on requests, and/or mock and stub responses. That said, there is a bit more work involved to start with. But the setup provides a very good guide with lots of examples. And the documentation is pretty good. If you know tools like Mocha or Chai then the test syntax should be largely familiar.
2 of 7
4
All your javascript should be in files.To run the unit tests the easiest way would be to run jest on node.js. You simply import your javascript code and test your functions. This assumes that you have your javascript code in .js files. If you don't have individual files / modules with your javascript code, you should probably overthink your project setup.Normally you would have a build step using a bundler like webpack or vite to generate your frontend js files. If you are using inline javascript in plainn html files I don't think you should be worrying about unit tests
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.
Mocha
mochajs.org
Mocha - the fun, simple, flexible JavaScript test framework
Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple and fun. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases.
Playwright
playwright.dev
Fast and reliable end-to-end testing for modern web apps | Playwright
Cross-browser. Playwright supports all modern rendering engines including Chromium, WebKit, and Firefox. Cross-platform. Test on Windows, Linux, and macOS, locally or on CI, headless or headed. Cross-language. Use the Playwright API in TypeScript, JavaScript, Python, .NET, Java.
Enable JavaScript
enable-javascript.com
How to enable JavaScript in your browser and why
In the "Settings" section click on the "Show advanced settings..." Under the the "Privacy" click on the "Content settings...". When the dialog window opens, look for the "JavaScript" section and select "Allow all sites to run JavaScript (recommended)". Click on the "OK" button to close it.
Linangdata
linangdata.com βΊ javascript-tester
Javascript Tester
July 8, 2022 - Great for testing ideas or running simple code snippets... This editor works entirely in your browser (it uses the Ace embeddable code editor.). Your code is not sent to any server. If you close the browser or tab the current state of the edior is saved. If you don't want you code saved remember ...
MDN Web Docs
developer.mozilla.org βΊ en-US βΊ docs βΊ Web βΊ JavaScript βΊ Reference βΊ Global_Objects βΊ RegExp βΊ test
RegExp.prototype.test() - JavaScript | MDN
Itβs been available across browsers since β¨July 2015β©. ... The test() method of RegExp instances executes a search with this regular expression for a match between a regular expression and a specified string. Returns true if there is a match; false otherwise.
DZone
dzone.com βΊ coding βΊ javascript βΊ how to test javascript code in a browser
How to Test JavaScript Code in a Browser
May 11, 2022 - Check out six popular tools and techniques for performance testing and debugging your application's JavaScript code in a browser, like JSFiddle and CodePen.