eMCP

Name: eMCP
Author: joeymeere

@joeymeere

Repository

About eMCP

A framework for building simple MCP servers with custom middleware

#mcp #model-context-protocol

Basic information

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "emcp": {
      "command": "bun",
      "args": [
        "run",
        "example:basic"
      ]
    }
  }
}

Tools

No tools detected

We auto-extract tools from the README. The maintainer can list them under a ## Tools heading to populate this section.

Overview

What is eMCP?

eMCP is a fork of the LiteMCP TypeScript library that adds built-in authentication handling and custom layered middleware support. It is designed as a near drop-in replacement for LiteMCP, with all added features being optional.

How to use eMCP?

Install via npm or Bun (npm i emcp or bun add emcp). You can run provided examples (bun run example:basic, bun run example:auth, etc.). Create a server instance by passing an authenticationHandler function and use server.use() to add custom middleware that runs before and after the standard MCP handler.

Key features of eMCP

All existing LiteMCP features preserved
Built‑in authentication handler for requests
Custom layered middleware support (runs in registration order)
Near drop‑in replacement for LiteMCP

Use cases of eMCP

Add authentication checks to every tool, resource, or prompt call
Log request‑response cycles with timing via middleware
Build complex MCP servers with reusable middleware layers
Migrate existing LiteMCP projects without major code changes

FAQ from eMCP

How is eMCP different from LiteMCP?

eMCP extends LiteMCP with an optional built‑in authentication handler and a custom middleware system, while remaining a near drop‑in replacement.

How does middleware execution work?

Middleware runs in the order it was registered. Each middleware calls next(), then the standard MCP handler runs. After the handler completes, middleware code after next() executes in reverse order.

What runtime or dependencies are required?

eMCP is a TypeScript library that requires Node.js with npm or Bun. It is installed via npm i emcp or bun add emcp.

Is authentication mandatory?

No, the authentication handler is optional. If not set, requests proceed without authentication.

Does eMCP support custom transports?

The README does not mention specific transports; it inherits the transport capabilities of LiteMCP (e.g., stdio, SSE).

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