Build Your First MCP Server in Under 100 Lines of JavaScript
This article explains how to build an MCP (Model Context Protocol) server using JavaScript. MCP is an open standard by Anthropic that allows AI assistants like Claude to connect to external tools, data sources, and services.
Why it matters
MCP enables a plug-and-play approach to AI integrations, making it easier for developers to extend the capabilities of AI assistants like Claude.
Key Points
- 1MCP standardizes AI integrations with a clean protocol that any AI client can use
- 2An MCP server exposes three primitives: Tools, Resources, and Prompts
- 3The article walks through building a real MCP server with developer utility tools
Details
MCP is a protocol that enables AI assistants to connect to external tools, data sources, and services. Before MCP, every AI integration was bespoke, requiring custom plugins or integrations. MCP provides a standardized way for AI clients to discover and use tools exposed by an MCP server. The article demonstrates how to build an MCP server in under 100 lines of JavaScript, exposing tools like UUID generation, hashing, base64, and JWT decoding. The key steps are setting up the project, creating the server skeleton, and registering the tools with the appropriate input schemas. This allows the AI client to discover and call the tools through the standard MCP protocol.
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