fastmcp
A TypeScript framework for building MCP servers.
The Lens
FastMCP is a TypeScript framework for building MCP servers. Instead of wiring up JSON-RPC handlers and transport layers yourself, you define tools and resources with decorators and let FastMCP handle the protocol plumbing. Think Express.js but for MCP.
Setup is npm install plus a few lines of code. You get type-safe tool definitions, automatic schema generation, and built-in validation. The API is clean enough that a working MCP server takes under 50 lines.
Use this if you're building MCP servers in TypeScript. It cuts the boilerplate dramatically. The catch: you're adding a dependency layer between your code and the protocol, so breaking changes in FastMCP mean updating your servers.
Free vs Self-Hosted vs Paid
fully freeFree Tier
The MCP server itself is completely free and open source.
Self-Hosted
Runs locally or on your own infrastructure.
Paid
No paid tier. The underlying service may have its own pricing.
Free and open source. No underlying service costs.
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