JSFiddle is an online code playground for testing, editing, and sharing HTML, CSS, and JavaScript snippets, designed for web developers and learners.

---

🚀 Overview

JSFiddle is a browser-based code editor that lets you quickly write, test, and preview HTML, CSS, and JavaScript code in real-time without needing a local development environment. It solves the problem of rapidly prototyping, debugging, and demonstrating frontend code snippets, making it easy to share working examples via unique links.

It's built for web developers, frontend engineers, Stack Overflow contributors, and coding learners who need a lightweight tool for quick experiments and collaboration. Originally created as a successor to MooShell for the MooTools JavaScript library community in 2010 by Piotr Zalewa and Oskar Krawczyk, it evolved into a widely-used platform to foster code sharing and testing.

The platform remains popular, ranking high among online IDEs, and continues to add modern features like AI code completion.

Answer these questions:

• What problem does this project solve? Quick, shareable web code testing without setup.
• Who is it built for? Web developers and learners.
• Why did you build it? To provide a simple playground for MooTools and general web code sharing.

Keep it human and honest.

---

✨ Key Features

• Live split-pane editor: Separate panels for HTML, CSS, JS with instant result preview using CodeMirror for syntax highlighting, linting, autocompletion, and more.
• Library integration: Easily add external JS/CSS libraries from CDNJS and others via sidebar search.
• Save, share, and fork: Create public 'fiddles' with unique URLs, fork others' code, set expiration; PRO users get collections.
• AI Code Completion: BYOK implementation using Mistral's Codestral model for intelligent suggestions.
• Boilerplates and tools: Pre-built templates for React, jQuery, Tailwind, TypeScript, etc.; console logging, async request simulation.
• Optional: Upcoming or experimental features via PRO early access.

---

🛠 Tech Stack

• Frontend: CodeMirror (editor), JavaScript, HTML/CSS
• Backend: Not publicly disclosed
• Database: Not publicly disclosed
• Auth: Custom user login
• Hosting: Self-hosted servers

---

👥 Who Is This For?

This project is useful for:

• Developers who want to prototype and debug frontend code quickly
• Teams looking for easy code snippet sharing in discussions or docs
• Indie makers building and testing web demos without local setup

---

📸 Screenshots / Demo

• Live demo: https://jsfiddle.net
• GitHub: https://github.com/jsfiddle

---

🔥 Project Status

• 🟢 Actively building

Last updated: 2026-03-24

---

❓ FAQ

Is this project free?

Freemium (Core features free and ad-supported; PRO at $8/month or $90 one-time yearly for ad-free, collections, early features.)

---

Is the source code available?

No — proprietary software, though the https://github.com/jsfiddle organization hosts related repositories and tools.

---

Can I contribute?

JSFiddle is proprietary; contribute feedback via GitHub issues in related repos or community discussions. No open PRs for core.

---

📬 Contact & Links

• Website: https://jsfiddle.net
• GitHub: https://github.com/jsfiddle
• Twitter/X: https://x.com/jsfiddle
• Email: Not publicly available

---

Built with ❤️ and kept warm on WarmIndex.