fastmcp
A TypeScript framework for building MCP servers.
The Lens
By Erik Loyd, SaaS CEO and former COO/CFO of an AWS Premier Partner.
Updated Apr 2026
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.
What to do by team size
- Solo
- free
- Small team
- free
- Larger team
- free
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