MCP JavaScript Server

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

This server cannot be installed

security - not tested

license - permissive license

quality - not tested

How are these scores calculated?

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

An unofficial JavaScript SDK to create customized servers for the Model Context Protocol, allowing definition of prompts, resources, and tools for tailored interactions.

Usage

Related Resources

Reddit Discussion about this server

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Usage

Prompts

Resources

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Debugging

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