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OnlineCompiler.io

Official registry Developer tools

Run Python, Java, C, C++, C#, Go, Rust and 39 more languages, each run in a fresh, offline sandbox.

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http onlinecompiler-io 'https://api.onlinecompiler.io/mcp' --header 'Authorization: <Optional: your OnlineCompiler.io API key as a Bearer token. Leave it out to sign in with OAuth instead. Get a free key at https://api.onlinecompiler.io/compilers/api-keys/>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "onlinecompiler-io": {
            "type": "http",
            "url": "https://api.onlinecompiler.io/mcp",
            "headers": {
                "Authorization": "<Optional: your OnlineCompiler.io API key as a Bearer token. Leave it out to sign in with OAuth instead. Get a free key at https://api.onlinecompiler.io/compilers/api-keys/>"
            }
        }
    }
}

Frequently asked questions

What is OnlineCompiler.io?

Run Python, Java, C, C++, C#, Go, Rust and 39 more languages, each run in a fresh, offline sandbox.

How do I install OnlineCompiler.io?

It runs as a remote server. In Claude Code: claude mcp add --transport http onlinecompiler-io 'https://api.onlinecompiler.io/mcp' --header 'Authorization: <Optional: your OnlineCompiler.io API key as a Bearer token. Leave it out to sign in with OAuth instead. Get a free key at https://api.onlinecompiler.io/compilers/api-keys/>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does OnlineCompiler.io need an API key?

Yes. It expects Authorization, which you set in its configuration.

Who maintains OnlineCompiler.io?

It is published by io.onlinecompiler. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.