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Servers/Code Execution/return0
Code ExecutionOfficial
R

return0

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

1 starsUpdated Nov 20, 2025
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Overview

MCP (Model Context Protocol) server for return0 - a tool for debugging production applications in real-time. return0 enables developers to debug production Node.js applications in real-time. It allows you to monitor and troubleshoot your applications by connecting to live variables, observing execution flow, and understanding runtime behavior directly within the Cursor IDE. This is especially powerful for debugging production applications built with Next.js and deployed on platforms like Vercel, where traditional debugging methods can be challenging.

Installation

npx -y @return-0/mcp-server

Configuration

{
  "mcpServers": {
    "return0": {
      "command": "npx",
      "args": [
        "-y",
        "@return-0/mcp-server"
      ],
      "env": {
        "RETURN0_API_KEY": "your-api-key-here"
      }
    }
  }
}

Capabilities

  • Extract live runtime values from production

    Ask the assistant to retrieve the current value, type, and timestamp of a variable using `variable_extractor`.

  • Debug production variables by file and line

    Specify a file path and line number to pull real-time data from a running Node.js application.

  • Inspect multiple variables across files

    Request runtime extraction for several variables spread across different source files in a single call.

Tags

  • debugging
  • development

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