An online code editor that runs completely in the browser. Uses WebAssembly to compile programs and run them right in the browser.
Languages currently supported
- C
- C++
- Python 3
Features
- Edit code with a advanced editor (CodeMirror)
- Syntax Highlighting
- Offline running
- Python Package support
- Multiple languages
- C/C++ standard library
- Dark theme
C and C++ are provided by the clang compiler compiled to WebAssembly, which comes from this project. Hopefully, Objective-C support can be added soon. Hence, clang and lld are running completely in the browser, limited only by the host computer's performance.
C/C++ standard library does not fully work, though a good amount of libraries are working just fine, like
iostreamandvector. I know thatchronodoes not work, and there are probably others that don't work too. I believe libraries that require access to specific hardware features will not work.
Python support is provided by Pyodide. Packages that are currently supported are the ones that Pyodide can build and preload. Right now, packages like matplotlib will not produce any graphical output, because the output area only displays stdout. Package support requires an internet connection. Python 2 is not supported. Head over to pyodide's project page to learn more about its capabilities and limitiations.
Tailwind.css is used for styling the app. Codemirror 6 is the editor used, I used this project to get CodeMirror working in React.
On startup, Pyodide is loaded, then a sample C++ program is run to ensure that clang and lld are ready.
Just clone this project using git clone or another method. Run npm install in the root directory and then run npm start.
npm build will create an optimized production build than can then be deployed to a static site provider, like Vercel or Netlify.