Alternatives

Products that do what Online JS Compiler does

Run JavaScript instantly in your browser - no setup needed

1. 1RU
   Run unsafe user generated JavaScript in the browser▲113

   I needed a way to let users write JavaScript to create plugins for a site I'm building. I couldn't find a solution I was happy with, so ended up building one that run's it in a web worker on a separate domain from your main site. Hopefully I haven't missed anything. If so, please let me know! My website has an interactive demo you can write code in the browser textarea, and see the output on the right. Interactive Demo: https://workerbox.net/ Github: https://github.com/markwylde/workerbox

   2022 · workerbox.net

2. 2EJ
   Execute JavaScript in a WebAssembly QuickJS sandbox▲206

   This TypeScript package allows you to safely execute JavaScript code within a WebAssembly sandbox using the QuickJS engine. Perfect for isolating and running untrusted code securely, it leverages the lightweight and fast QuickJS engine compiled to WebAssembly, providing a robust environment for code execution. Features - *Security*: Run untrusted JavaScript code in a safe, isolated environment. - *File System*: Can mount a virtual file system - *Custom Node Modules*: Custom node modules are mountable - *Fetch Client*: Can provide a fetch client to make http(s) calls - *Test-Runner*: Includes…

   2024 · github.com

3. 3SU
   Speed up your site by running JavaScript when the browser is idle▲94

   2022 · npmjs.com

4. 4JL
   JS library to make your website instant▲426

   http://instantclick.io/ It seems the internet architecture won't bring us instant websites anytime soon. So here is a hack. I released this JS library last month (today is version 2.0 release, fixing v1.0's rough edges), it makes use of HTML5's pushState and preloading to make a website instant. It works like this: before clicking on a link, you'll hover over it. And there's a delay of 200-300 ms between these two events. InstantClick uses this delay to preload a page, when you click on a link it will display instantly in most case. (You can test on the website.) That's…

   2014

5. 5
   Compile Bytes▲6

   Free online code playground for 24+ programming languages

   Oct 2025

6. 6
   CodeRunner Pro▲5

   Code Instantly. No Setup Required.

   Jan 2026 · coderunnerpro.site

7. 7
   PlayJS▲138

   Playground JavaScript web, now with superpowers

   2023

8. 8
   Offline JS Playground▲97

   Write, run, and test JavaScript snippets & JSON offline

   20d ago · chromewebstore.google.com

9. 9JB
   JavaScript books, free online▲222

   2016 · exploringjs.com

10. 10
    Code, Test, and Preview in Real-Time▲1

    Online html, css/scss, and javascript compiler

    Oct 2025

11. 11
    JavaScript.com▲217

    A free resource for learning and developing in JavaScript

    2015

12. 12
    Code editor by Flawwwless▲89

    An online Javascript code editor 🤖

    2019

13. 13AT
    A tiny web browser implementation with V8 JavaScript engine and Rust▲144

    2021 · github.com

14. 14
    Codeer▲7

    Free online compiler & code editor | programming tools

    2025

15. 15WG
    Write Go code in JavaScript files▲158

    I built a Vite plugin that lets you write Go code directly in .js files using a "use golang" directive. It compiles to WebAssembly automatically.

    Oct 2025 · npmjs.com

16. 16PP
    Paper Programs – Run JavaScript on pieces of paper▲235

    2018 · paperprograms.org

17. 17JA
    Joy – a Go to JavaScript compiler▲201

    2017 · mat.tm

18. 18QR
    QuickBEAM – run JavaScript as supervised Erlang/OTP processes▲113

    QuickBEAM is a JavaScript runtime embedded inside the Erlang/OTP VM. If you’re building a full-stack app, JavaScript tends to leak in anyway — frontend, SSR, or third-party code. QuickBEAM runs that JavaScript inside OTP supervision trees. Each runtime is a process with a `Beam` global that can: - call Elixir code - send/receive messages - spawn and monitor processes - inspect runtime/system state It also provides browser-style APIs backed by OTP/native primitives (fetch, WebSocket, Worker, BroadcastChannel, localStorage, native DOM, etc.). This makes it usable for: - SSR…

    Mar 2026 · github.com

19. 19IW
    I wrote a .NET to JS compiler. Here's an XNA demo compiled to JS.▲103

    2011 · hildr.luminance.org

20. 20AE
    An Easy Programming Language That Runs in the Browser▲138

    2018 · kabas.online

21. 21
    JavaScript for Starters: The Guide▲80

    Learning JavaScript is the best investment you can do today.

    2022

22. 22AC
    A complete Bash parser in JavaScript transpiled from Go▲89

    2018 · npmjs.com

23. 23
    myCompiler▲122

    Run your favourite programming languages online

    2019

24. 24
    Twig▲77

    console.logs for cloud development

    2020

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