Fresh JavaScript MCP Server - A Development Tool Supporting Code Execution, REPL Sessions, and TS Transpilation

Fresh JavaScript

A JavaScript execution server based on the MCP protocol, supporting code execution, REPL sessions, and TypeScript transpilation

Developer tools Artificial intelligence chatbots #JS Execution #REPL Service #MCP Tool #TS Support Local .TypeScript

rating : 2 points

downloads : 16

update time : 2025-04-28

What is the JavaScript MCP Server?

The JavaScript MCP Server is a tool based on the Model Context Protocol (MCP) that allows AI models to achieve dynamic interaction by running JavaScript or TypeScript code. It supports one-time script execution, persistent REPL session management, npm package import, and named pipe communication.

How to use the JavaScript MCP Server?

Simply install and start the server, then you can execute JavaScript code through the command line or API calls. It supports standard mode, interactive REPL mode, and named pipe mode.

Applicable Scenarios

Suitable for application scenarios that require dynamic execution of JavaScript code, such as automation tasks, data analysis, and prototype development.

Main Features

JavaScript ExecutionSupports running JavaScript code once and quickly obtaining results.

REPL Session ManagementCreate persistent REPL sessions to facilitate state preservation during multiple interactions.

TypeScript SupportAutomatically transpiles TypeScript code into JavaScript and then executes it.

npm Package IntegrationAllows direct import and use of npm packages without manual configuration.

Named Pipe InterfaceEfficiently communicates with external processes through named pipes.

Multi-Mode OperationProvides standard mode, interactive mode, and named pipe mode for selection.

Advantages and Limitations

Advantages

Supports multiple programming languages (JavaScript and TypeScript)

Built-in npm package management function simplifies dependency introduction

Supports persistent REPL sessions to improve development efficiency

Flexible operation modes adapt to different needs

Easy to expand and integrate into existing systems

Limitations

May require additional optimization for high-concurrency scenarios

Some advanced features may require familiarity with the MCP protocol

Initial configuration may require a certain learning cost

How to Use

Clone the Project Repository

Use Git to clone the server code.

Install Dependencies

Install the Node.js modules required by the project.

Build the Project

Compile the project code to prepare for running.

Start the Server

Start the server in standard mode.

Usage Examples

Example 1: Execute a Simple ScriptRun a simple JavaScript code.

Example 2: Create a REPL SessionCreate a persistent REPL session and run multiple commands in it.

Frequently Asked Questions

How to install the JavaScript MCP Server?

Does it support TypeScript?

How to exit the interactive REPL mode?

Related Resources

GitHub Repository

The official GitHub repository, containing the complete code and documentation.

Project Documentation

Detailed project description and usage guide.

Example Code

Contains multiple practical usage examples.

🚀 JavaScript MCP Server

A JavaScript execution server for the Model Context Protocol (MCP), allowing AI models to run JavaScript code via MCP tools.

🚀 Quick Start

The JavaScript MCP Server enables AI models to execute JavaScript code using the MCP. Here's how to get started:

📦 Installation

# Clone the repository
git clone https://github.com/yannbam/fresh-js-mcp.git
cd fresh-js-mcp

# Install dependencies
npm install

# Build the project
npm run build

💻 Usage

# Start the MCP server in standard mode
npm start

# Start in interactive REPL mode
node dist/index.js --interactive

# Start with the named pipe interface
node dist/index.js --pipe

# View all options
node dist/index.js --help

Running Modes

The server supports three running modes:

Standard MCP Mode (default): Communicate using the Model Context Protocol via stdio.
Interactive Mode: Provide a REPL interface for direct user interaction.
Pipe Mode: Communicate with external processes using named pipes.

For detailed descriptions of these modes, refer to the examples directory.

Available Tools

execute: Run JavaScript code once and return the result.
createSession: Create a new REPL session.
executeInSession: Execute code in an existing session.
listSessions: List all active REPL sessions.
deleteSession: Delete a REPL session.

✨ Features

JavaScript Execution: Run JavaScript code in a one - off script execution mode.
REPL Sessions: Maintain a stateful REPL session across multiple interactions.
TypeScript Support: Run TypeScript code and automatically transpile it.
NPM Integration: Dynamically import and use npm packages.
Interactive Mode: Provide a direct command - line REPL interface for interaction.
Named Pipe Interface: Communicate with external processes via named pipes.

🔧 Development

# Run in development mode with hot reloading
npm run dev

# Check the code
npm run lint

# Run tests
npm test

📚 Documentation

Architecture

The JavaScript MCP Server follows a layered architecture:

MCP Protocol Layer: Handle client communication.
JavaScript Execution Layer: Execute code in an isolated environment.
Resource Management Layer: Manage packages and TypeScript.
Session Management Layer: Maintain state - persistent REPL sessions.

📄 License

MIT

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