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2025-01-20

An unofficial JavaScript SDK for Model Context Protocol

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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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    Reviews

    5 (1)
    Avatar
    user_jOA2yttK
    2025-04-16

    I've been using mcp-js-server by davlgd, and it's been fantastic! This Node.js server is highly reliable and easy to set up. The comprehensive documentation available at the GitHub link makes it simple to get started, and the project is well-maintained. It's an excellent choice for anyone looking to create robust applications quickly. Highly recommended!