Lite mcp for javascript Introduction

Lite mcp for javascript is the BEST yet way to start a REMOTE SSE javascript MCP server and Client.

🚀 Quick start

REAL COPY AND PASTE experince for you to get started with MCP.

Installation

npm install litemcpjs
npm install express
npm install cors

Build a SSE MCP client under 5 lines

import { MCPClient } from "litemcpjs";

async function main() {
  const client = new MCPClient("http://localhost:3000") // change this to your server url
  await client.connect()
  await client.listTools()
  const result = await client.callTool("calculate-bmi", {weightKg: 70, heightM: 1.75})
  console.log(result)
}

main();

Start a REMOTE MCP SSE server with expressJS

const { MCPServerInit } = require("litemcpjs");

// define the tools
const TOOLS = [
    {
        name: "calculate-bmi",
        description: "Calculate the BMI of a person",
        inputSchema: {
            type: "object",
            properties: {
                weightKg: { type: "number" },
                heightM: { type: "number" },
            },
            required: ["weightKg", "heightM"],
        },
        method: async ({ weightKg, heightM }) => {
            return {
                content: [{
                    type: "text",                
                    text: String(weightKg / (heightM * heightM))
                }]
            }
        }
    }
];

// define extra handlers for resources etc.
const handlers = {};

// compatible for server have .use(middleware) method such as express
const middlewares = [
    cors(),
];

const MCPapp = express();  

const MCPServer = MCPServerInit(
    MCPapp,
    middlewares,
    handlers,
    TOOLS,
).listen(5556);

🤝 Contributing

Contributions are welcome! Please open an issue or submit a pull request.

Please read the contributing document.

📝 Licensing

This project is licensed under the MIT License. See the LICENSE file for details.

Inspired by Original anthropic sdk,which license is also included here.