JavaScript MCP Auth Server

JavaScript MCP Auth Server

Demonstrates MCP remote authentication boundary with OAuth 2.0, Keycloak token introspection, audience and scope validation, and protected tools.

Category
Visit Server

README

JavaScript MCP Auth Server

This package shows the remote MCP auth boundary in JavaScript:

  • Express HTTP server
  • MCP Streamable HTTP transport at /mcp
  • Protected Resource Metadata
  • Bearer token middleware
  • Keycloak token introspection
  • audience validation
  • mcp:tools scope enforcement
  • protected add_numbers and server_status tools

Run

pnpm mcp-auth-server-js install
cp .env.example .env
pnpm mcp-auth-server-js demo:keycloak
pnpm mcp-auth-server-js start

For the demo, configure Keycloak with:

  • client scope: mcp:tools
  • MCP server confidential client: mcp-server
  • demo client/user for obtaining an access token
  • token audience: http://localhost:3000/mcp

Demo Scripts

pnpm mcp-auth-server-js demo:no-token
pnpm mcp-auth-server-js demo:metadata
pnpm mcp-auth-server-js demo:get-token
pnpm mcp-auth-server-js demo:call-tool
pnpm mcp-auth-server-js demo:bad-scope

The important point is the failure order:

  1. no token returns 401 with WWW-Authenticate
  2. metadata tells the client where auth lives
  3. token introspection rejects inactive tokens
  4. audience validation rejects tokens for another API
  5. scope validation rejects tokens without mcp:tools

Recommended Servers

playwright-mcp

playwright-mcp

A Model Context Protocol server that enables LLMs to interact with web pages through structured accessibility snapshots without requiring vision models or screenshots.

Official
Featured
TypeScript
Magic Component Platform (MCP)

Magic Component Platform (MCP)

An AI-powered tool that generates modern UI components from natural language descriptions, integrating with popular IDEs to streamline UI development workflow.

Official
Featured
Local
TypeScript
Audiense Insights MCP Server

Audiense Insights MCP Server

Enables interaction with Audiense Insights accounts via the Model Context Protocol, facilitating the extraction and analysis of marketing insights and audience data including demographics, behavior, and influencer engagement.

Official
Featured
Local
TypeScript
VeyraX MCP

VeyraX MCP

Single MCP tool to connect all your favorite tools: Gmail, Calendar and 40 more.

Official
Featured
Local
graphlit-mcp-server

graphlit-mcp-server

The Model Context Protocol (MCP) Server enables integration between MCP clients and the Graphlit service. Ingest anything from Slack to Gmail to podcast feeds, in addition to web crawling, into a Graphlit project - and then retrieve relevant contents from the MCP client.

Official
Featured
TypeScript
Kagi MCP Server

Kagi MCP Server

An MCP server that integrates Kagi search capabilities with Claude AI, enabling Claude to perform real-time web searches when answering questions that require up-to-date information.

Official
Featured
Python
E2B

E2B

Using MCP to run code via e2b.

Official
Featured
Neon Database

Neon Database

MCP server for interacting with Neon Management API and databases

Official
Featured
Exa Search

Exa Search

A Model Context Protocol (MCP) server lets AI assistants like Claude use the Exa AI Search API for web searches. This setup allows AI models to get real-time web information in a safe and controlled way.

Official
Featured
Qdrant Server

Qdrant Server

This repository is an example of how to create a MCP server for Qdrant, a vector search engine.

Official
Featured