Python libraries for building REST

Short summary

Comprehensive guide to composing custom REST API stacks in Python using lightweight, purpose-built libraries instead of full frameworks. Covers ASGI servers (Uvicorn, Granian), routing (Starlette, Lilya), validation (Pydantic, Marshmallow, msgspec), and HTTP clients with practical tradeoffs. Ideal for microservices, performance-critical APIs, and custom architectures.

• •Uvicorn and Granian are fast ASGI servers; Starlette's Router handles routing without full framework overhead
• •Pydantic, Marshmallow, and msgspec offer validation/serialization with different performance and API tradeoffs
• •Library composition works best for microservices, performance-critical systems, and custom architectural needs

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