hybrid server

The server is able to function both locally and remotely, depending on the configuration or use case.

Integrations

Provides a secure JavaScript REPL (Read-Eval-Print-Loop) environment to execute code snippets with error handling, memory management, and output formatting.
Enables secure access to Node.js built-in modules and execution of JavaScript code in a sandboxed VM context with working directory support.
Allows running the REPL directly via npx without installation or installing it globally through npm for repeated usage.

🚀 Direct Node.js REPL Executor

🧙‍♂️ Simplified JavaScript Execution Environment

A streamlined direct Node.js execution environment that enables seamless code execution with full support for:

ESM Modules - Native import/export syntax
Dynamic Imports - Full support for await import()
CommonJS compatibility - Works with require() through createRequire
Native Node.js API access - Direct access to all Node.js features

🧩 Configuration

For Cursor, update your .cursor/mcp.json configuration:

{
  "mcpServers": {
    "mcp-repl": {
      "command": "node",
      "args": [
        "path/to/direct-node-executor.js", "path/to/your/project"
      ],
      "env": {},
      "disabled": false,
      "autoApprove": ["execute"]
    }
  }
}

✨ Features

🚀 Direct Node.js Execution: Runs code directly in Node.js without VM sandboxing
📦 Full Module Support: Seamless support for ESM and CommonJS modules
⏱️ Real-time Feedback: Get immediate results from code execution
🔍 Enhanced Debugging: Clean output with proper error handling
🧠 Simple Architecture: Streamlined implementation with minimal complexity
🔄 File System Access: Full access to the file system for real testing

🛠️ Implementation Details

This implementation:

Creates temporary .mjs files for each execution
Runs the code directly with Node.js in a separate process
Captures all console output and execution results
Cleans up temporary files automatically
Returns standardized results to the MCP client

📝 Usage Examples

// Dynamic imports
const fs = await import('fs/promises');
const path = await import('path');

// Reading files
const content = await fs.readFile('package.json', 'utf8');
console.log(JSON.parse(content));

// Using path utilities
console.log(path.join('folder', 'file.txt'));

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A

security – no known vulnerabilities

F

license - not found

A

quality - confirmed to work

A secure JavaScript REPL server that enables executing code snippets in a sandboxed environment with memory protection, timeout handling, and comprehensive error reporting.

MCP-REPL