OnlineCompiler.io

MCP server · by onlinecompiler

Developer Tools Streamable HTTP v1.2.0

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

Website ↗ Generate config for multiple servers More servers

Install

Pin version unavailable — hosted endpoints aren’t versioned

Streamable HTTP
https://api.onlinecompiler.io/mcp

Setup by client

Pick your client — the config below is generated for this server (hosted endpoint). Copy respects the “Pin version” switch above.

Remote (hosted) endpoint

https://api.onlinecompiler.io/mcp

Claude Desktop: Settings → Connectors → Add custom connector, paste this URL, and provide: Authorization.

Format verified against the official Claude Desktop docs ↗.

terminal

claude mcp add --transport http compiler https://api.onlinecompiler.io/mcp --header "Authorization: Bearer <YOUR_AUTHORIZATION>"

Format verified against the official Claude Code docs ↗.

.cursor/mcp.json (hosted endpoint)

{
  "mcpServers": {
    "compiler": {
      "url": "https://api.onlinecompiler.io/mcp",
      "headers": {
        "Authorization": "<YOUR_AUTHORIZATION>"
      }
    }
  }
}

Format verified against the official Cursor docs ↗.

.vscode/mcp.json (hosted endpoint)

{
  "servers": {
    "compiler": {
      "type": "http",
      "url": "https://api.onlinecompiler.io/mcp",
      "headers": {
        "Authorization": "<YOUR_AUTHORIZATION>"
      }
    }
  }
}

Format verified against the official VS Code docs ↗.

mcp_config.json (hosted endpoint)

{
  "mcpServers": {
    "compiler": {
      "serverUrl": "https://api.onlinecompiler.io/mcp",
      "headers": {
        "Authorization": "<YOUR_AUTHORIZATION>"
      }
    }
  }
}

Format verified against the official Windsurf docs ↗.

Environment variables

Defined in the server's official registry manifest. Required secrets are shown as <YOUR_…> placeholders in the configs above.

Authorization secret header — 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/

About this server

Distributed as Streamable HTTP, listed under Developer Tools. Review our MCP security guide before granting access to real data.

Frequently asked questions

How do I install OnlineCompiler.io?

Run the install command shown above, then paste the config for your client (Claude Desktop, Claude Code, Cursor, VS Code or Windsurf) into its MCP settings and restart the client.

Is OnlineCompiler.io free to use?

The MCP server itself is free to install. Any third-party service it calls may require its own API key and account.

Which clients support OnlineCompiler.io?

Any MCP-compatible client can use it, including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf and custom agents.

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