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MCP JavaScript Server

MCP JavaScript Server

Public
davlgd/mcp-js-server

An unofficial JavaScript SDK for Model Context Protocol enabling creation and management of customizable prompts, resources, and tools to build flexible and interactive AI-driven servers.

javascript
0 tools
May 30, 2025
Updated Jun 4, 2025

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MCP Server - JavaScript SDK

This is an unofficial JavaScript SDK for Model Context Protocol.

Usage

Import the package to your project:

npm install mcp-js-server

Create files to define the server's prompts, resources, and tools.

Prompts

// prompts.js export const prompts = { hello_world: { description: 'A simple prompt that says hello.', arguments: [], messages: [{ role: 'assistant', content: { type: 'text', text: 'Hello, world!' } }] } };

Resources

// resources.js export const resources = { apiReference: { uri: 'https://api.example.com/openapi.json', mimeType: 'application/json' } };

Tools

// tools.js export const tools = { simple_tool: { description: 'A simple tool', handler: async () => new Date().toLocaleString(), schema: { type: 'object', properties: {}, required: [] } }, complex_tool: { description: 'A complex tool', handler: async ({ param1, param2 }) => { return `param1: ${param1}, param2: ${param2}`; }, schema: { type: 'object', properties: { param1: { type: 'string' }, param2: { type: 'string' } }, required: ['param1', 'param2'] } } };

Server

Then create a server instance with the following code:

// server.js import { MCP } from 'mcp-server'; import { tools } from './tools.js'; import { prompts } from './prompts.js'; import { resources } from './resources.js'; const infos = { name: 'mcp-demo-server', version: '0.1.0' }; const server = new MCP(infos, prompts, resources, tools);

Debugging

You can find logs of the server in your user system logs directory:

Linux:   ~/.local/share/logs
macOS:   ~/Library/Logs
Windows: %USERPROFILE%\AppData\Local\Logs
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