JSFiddle
Test JavaScript, HTML, and CSS snippets online.
Open the official app on jsfiddle.net
This tool is hosted by its maintainers. Click below to open jsfiddle.net in a new tab — it's their official demo.
Browse developer tools →What's next with JSFiddle?
Choose how you want to get started.
Use it free
Open the official tool or demo — no account needed.
Self-host it
Run the open-source version on your own infrastructure.
What is JSFiddle?
JSFiddle is an open-source web tool designed for testing and sharing HTML, CSS, and JavaScript code snippets. It provides an integrated environment where developers can write, execute, and debug code in real-time, with immediate visual feedback. The tool is particularly useful for front-end developers who need to experiment with interactive web components or demonstrate code functionality to others. By offering preloaded JavaScript libraries, JSFiddle simplifies the process of testing code without requiring users to manually include external dependencies. Its primary audience includes web developers, educators, and learners who seek a lightweight solution for rapid prototyping and collaboration. JSFiddle addresses the challenge of quickly validating code ideas without setting up a full development environment, making it a go-to resource for troubleshooting and sharing code examples.
How it works
JSFiddle is a web-based code editor that allows users to write and test HTML, CSS, and JavaScript code simultaneously. It serves as a sandbox for experimenting with front-end web development concepts, enabling developers to isolate and debug specific code segments efficiently. The tool’s primary purpose is to facilitate quick prototyping and collaboration by providing an online workspace where users can share functional code examples with others. It is particularly valuable for demonstrating code behavior in real-time without requiring local setup. JSFiddle supports real-time rendering of HTML and CSS, with live updates as code is modified. It includes built-in access to popular JavaScript libraries like jQuery, React, and Angular, allowing users to test code without manual inclusion. The editor also features a console for debugging and a preview pane for visual output.
How to use it
- 1Navigate to jsfiddle.net and select the HTML, CSS, and JavaScript panels. 2. Enter code into the respective panels, using preloaded libraries or adding custom ones via the 'External Resources' section. 3. Click the 'Run' button to see live results in the preview pane. 4. Use the console for debugging or test edge cases by modifying variables. Practical tips include using the 'Save' option to store fiddles for later access, leveraging the 'History' feature to track changes, and testing cross-browser compatibility by adjusting settings in the 'Options' menu.
What it can do
- code playground
Use cases
Assumptions and limitations
Assumptions
- source: https://jsfiddle.net/
- license: Open source
- privacy: Opens an external demo
Limitations
- Lacks support for server-side scripting languages like PHP or Node.js
- Limited customization of the code execution environment
- No integration with version control systems like Git
- Cannot execute code that relies on local file systems or APIs
- Limited library support compared to dedicated code editors
Understanding the result
Test JavaScript, HTML, and CSS snippets online.
Tool details
- Clearly flagged when a network request is needed.
- No account, no sign-up, and no tracking of your content.
- Powered by (MIT).
- Built with
- (https://jsfiddle.net/)
- License
- MIT
- Runs locally
- No — requires a network request
- Verification
- Not yet verified
- Input
- Query
- Output
- Text
Built with https://jsfiddle.net/. OpenToolVault provides the discovery and browser interface while crediting the original project maintainers.
- Built with
- License
- MIT
Open-source project
OpenToolVault is an independent directory. We are not affiliated with or endorsed by this project.
References
- / — GitHub Repository
Upstream project · GitHub
Frequently asked
What is JSFiddle used for?
JSFiddle is used for testing and sharing HTML, CSS, and JavaScript code snippets. It allows developers to experiment with front-end code, debug issues, and demonstrate functionality to others without requiring a local development environment. It is particularly useful for isolating and validating specific code segments.
How does JSFiddle execute code?
JSFiddle runs code in a sandboxed environment within the browser using an embedded web server. HTML, CSS, and JavaScript are executed in isolated iframes to prevent conflicts with the host page. The tool leverages existing browser capabilities and preloaded libraries to provide an interactive testing experience.
How do I share a JSFiddle?
After creating a fiddle, click the 'Save' button to store it. A unique URL is generated, which can be shared via email, social media, or embedded in websites. The URL includes parameters to preserve code state, ensuring recipients see the exact version intended.
How does JSFiddle compare to CodePen or JSBin?
JSFiddle focuses on simplicity and lightweight testing, with a streamlined interface for quick prototyping. CodePen offers more advanced features like theme customization and a larger library of code snippets. JSBin emphasizes real-time collaboration and has a more robust version history system, making it suitable for complex projects.
What should I do if my code isn’t working in JSFiddle?
First, check for syntax errors in the console. Ensure all required libraries are included via the 'External Resources' section. If the issue persists, simplify the code to isolate the problem. For advanced debugging, use the browser’s developer tools to inspect elements and network requests.