Lite_MCP_sdk

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();

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);

const { Server, SSEServerTransport } = require("lite-mcp-sdk");

//or module import
import { Server, SSEServerTransport } from "lite-mcp-sdk";

//create a server
const server = new Server({
    port: 3000,
    transport: new SSEServerTransport(),
});


// 1. Define the server info
const server = new Server({
    name: "example-servers/puppeteer",
    version: "0.1.0",
}, {
    capabilities: {
        resources: {},
        tools: {},
    },
});

// 2. Define the request handlers
server.setRequestHandler("tools/call", async (request) => {
    const { name, arguments: args } = request.params;
    return handleToolCall(name, args);
});

//3. Define the transport
const transports = new Map();
const transport = new SSEServerTransport("/messages", res);
transports.set(clientId, transport);

//4. Connect the server to the transport
await server.connect(transport);

//5. Handle the post message
await transport.handlePostMessage(req, res);

import { Client, SSEClientTransport } from "lite-mcp-sdk";

// 1. Define the client
let client = new Client( {
      name: "fastmcp-client",
      version: "0.1.0"
    }, {
      capabilities: {
        sampling: {},
        roots: {
          listChanged: true,
        },
      },
    } );

// 2. Init the client transport
const serverUrl = "http://localhost:3000"; // for example

const backendUrl = new URL(`${serverUrl}/sse`);
  
backendUrl.searchParams.append("transportType", "sse");

backendUrl.searchParams.append("url", `${serverUrl}/sse`);

const headers = {};

const clientTransport = new SSEClientTransport(backendUrl, {
    eventSourceInit: {
        fetch: (url, init) => fetch(url, { ...init, headers }),
    },
    requestInit: {
        headers,
    },
});

// 3. Connect the client to the transport
await client.connect(clientTransport);
const abortController = new AbortController();
let progressTokenRef = 0;

// 4. start the tool call
const name = "toolcall name";
const params = {}; // tool call params

const response = await client.request(
    {
          method: "tools/call",
          params: {
            name,
            arguments: params,
            _meta: {
              progressToken: progressTokenRef++,
            },
          },
    },
    {signal: abortController.signal,}
);

const validatedMessage = validator(message);