OnlineCompiler.io plugins and integrations

Which plugins and integrations are there?

All of them are free and open source, in the onlinecompiler-io organization on GitHub, so you can read exactly what each one sends. The website and docs plugins use a free widget key, made to sit in public pages. The clients use an API key kept on your server, and the MCP server takes a sign-in or an API key.

Need an integration that isn't here?

These are the integrations we have today, and the list grows with what people ask for. If you need OnlineCompiler.io in a platform we don't cover yet, such as another learning platform, docs tool, website builder, CMS or AI agent framework, tell us and we'll build the integration for you, free of charge. We publish it as open source in our GitHub organization and list it on this page, so everyone on that platform can use it too.

To ask, write to hello@onlinecompiler.io or use the contact page, with:

• the platform, and the version you use;
• what your readers, students or users should be able to do: run code examples, solve graded exercises, take an exam, or let an AI agent run the code it writes;
• a link to your site or course, if it is public.

We reply to every request and tell you what we can build. The integration costs nothing; the code it runs uses your OnlineCompiler.io account, whose free plan has 100,000 runs a month with no credit card.

Some platforms need no new plugin. Sphinx, Mintlify and other docs tools already work with the widget, as runnable code examples in docs shows, and any site that can add a script tag can use the embeddable code editor today.

Plugins for websites and docs

Runnable code examples in your posts and docs: readers edit the code and run it in the page, with no account.

npm install docusaurus-plugin-onlinecompiler

pip install mkdocs-onlinecompiler

Learning platforms

Programming quizzes and exams in your LMS, with the code run in a hosted sandbox.

API clients

Run code and judge it against tests from your own server, in a few lines.

npm install onlinecompiler

pip install onlinecompiler

AI assistants and agents

Let an AI model run the code it writes and check it against tests, in a sandbox.

https://api.onlinecompiler.io/mcp

/plugin marketplace add onlinecompiler-io/onlinecompiler-mcp
/plugin install onlinecompiler@onlinecompiler

gemini extensions install https://github.com/onlinecompiler-io/onlinecompiler-mcp

npm install onlinecompiler ai

Starter templates

Working projects to fork, each calling the API the way a real app should.

Does it work with code written for Judge0, Piston or Jobe?

Yes, without a plugin. The API also answers in the shapes those three use, so existing code keeps working with a new base URL and key:

• Judge0 clients: see migrating from Judge0 and the Judge0-compatible API.
• Piston clients: see the Piston API alternative and the Piston-compatible API.
• Moodle CodeRunner: see the hosted Jobe server and the Jobe API.

Which one should I use?

• Code examples readers can run in a blog or docs: the WordPress, Docusaurus or MkDocs plugin. On any other site, the embeddable code editor is one script tag.
• Programming quizzes and exams in Moodle: the Moodle plugin for CodeRunner.
• Your own app, judge or grader: the Node.js or Python client, or a starter template to fork.
• An AI assistant or agent that runs code: the MCP server, or the Vercel AI SDK tools in your own agent.
• A platform that isn't listed: ask us for an integration, and we'll build it free.

Frequently asked questions

Does OnlineCompiler.io have a WordPress plugin?

Yes. OnlineCompiler.io Code Runner adds a Code runner block and an [onlinecompiler] shortcode, so readers can edit and run code examples in a post. It is in review for the WordPress.org plugin directory; until it is listed, install the ZIP from GitHub.

How do I make code examples runnable in Docusaurus or MkDocs?

Install docusaurus-plugin-onlinecompiler from npm or mkdocs-onlinecompiler from PyPI, add your widget key to the config, and write runnable after a code block's language (```python runnable). Readers can then edit the code and run it in the page.

Is there a Moodle plugin for CodeRunner?

Yes. OnlineCompiler.io for CodeRunner is a Moodle admin tool: paste an API key and it sets CodeRunner's Jobe server and Jobe API key, tests the connection, and can put your own Jobe settings back. Without the plugin, the same two settings can be typed in by hand.

Is there an MCP server for running code?

Yes, a hosted one at https://api.onlinecompiler.io/mcp. Claude, ChatGPT, Codex, VS Code and other MCP clients connect to it by URL, with a sign-in or an API key. There is also a Claude Code plugin and a Gemini CLI extension that install it.

Are the plugins and clients free?

Yes, all of them, and their code is public on GitHub. Running code uses your OnlineCompiler.io account, whose free plan has 100,000 runs a month with no credit card.

Which languages do they run?

All 46: Python, C, C++, Java, C#, F#, Go, Rust, PHP, Ruby, Haskell, TypeScript, JavaScript, SQL, DuckDB, Bash, Fortran, Visual Basic, Kotlin, R, Swift, COBOL, Perl, Julia, Pascal, Octave, Assembly, Lua, OCaml, Common Lisp, Erlang, Elixir, Prolog, D, FreeBASIC, Dart, Clojure, Groovy, Scala, Zig, Nim, Crystal, Ada, PowerShell, Racket, Objective-C.

Can you build an integration for my platform?

Yes, free of charge. Write to hello@onlinecompiler.io with the platform, the version you use and what your users should be able to do. We publish each new integration as open source and list it on this page. Running code through it uses your OnlineCompiler.io account, whose free plan has 100,000 runs a month.