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return0 MCP Server

@getreturn0

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基本情報

カテゴリ

開発者ツール

トランスポート

stdio

作者

getreturn0

投稿者

returnzero

return0 MCP Server について

Debug your remote Node.js and Next.js applications directly from your AI IDE like Cursor.

#return0#debugging#nodejs#nextjs#cursor-ide

return0 MCP Server の設定

以下の設定を使って、このサーバーを MCP 対応クライアントに追加してください。

{
  "mcpServers": {
    "return0": {
      "command": "npx",
      "args": [
        "-y",
        "@return-0/mcp-server"
      ],
      "env": {
        "RETURN0_API_KEY": "YOUR-API-KEY"
      }
    }
  }
}

return0 MCP Server のツール

ツール一覧はまだありません

この掲載には表示できるツール一覧がまだありません。サーバーにツールがないという意味ではありません。対応機能はプロジェクトのドキュメントをご確認ください。

上のボタンで一時的なサンドボックスでこのサーバーを実行し、ツール一覧を取得できます。

概要

What is return0?

return0 is an MCP server for debugging production Node.js applications in real-time. It integrates with Cursor IDE to monitor variables, observe execution flow, and understand runtime behavior in live environments, especially for Next.js apps deployed on platforms like Vercel.

How to use return0?

Install by configuring the MCP server in Cursor IDE. Use the one‑click install button or manual setup by adding a server named return0 with command npx, args -y @return-0/mcp-server, and environment variable RETURN0_API_KEY set to your API key. Provide an API key (or "demo" for testing) to authenticate.

Key features of return0

  • Provides a variable_extractor tool for extracting runtime variable values.
  • Reads source files from the local filesystem.
  • Uses TypeScript AST analysis to correct variable line numbers.
  • Connects to live production applications to retrieve runtime data.
  • Returns real‑time variable values, types, and timestamps.

Use cases of return0

  • Debug production Node.js applications without redeploying.
  • Monitor live variable values in Next.js apps on Vercel.
  • Troubleshoot runtime behavior directly from Cursor IDE.
  • Extract and inspect variables at specific line numbers in production code.

よくある質問

1

How do I get an API key for return0?

Visit the [return0 documentation](https://getreturn0.com/docs) to obtain your API key. You can also use `"demo"` for testing purposes.

2

What tool does return0 provide?

It provides a `variable_extractor` tool that extracts the runtime value, type, and timestamp of variables from production code based on file paths and variable names with line numbers.

3

How do I configure return0 in Cursor IDE?

You can either use the one‑click installation button or manually add a server with name `return0`, command `npx`, args `-y @return-0/mcp-server`, and the environment variable `RETURN0_API_KEY`. See the manual configuration steps in the README.

4

What are the runtime requirements for return0?

Node.js and npm are required because the server runs via `npx` and is installed automatically when Cursor starts.

5

Where does my production variable data live?

The MCP server reads source files from your local filesystem and connects to your running production application to retrieve live variable values. Data is not stored persistently by the server.

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