Comment by afidrya

Fastify is absolutely fantastic. It has the concept of "type providers", allowing you to pair it with fastify-type-provider-json-schema-to-ts (for JSON schemas) or another typing system of choice, such as Zod, to obtain strongly typed queries, request bodies, and responses in handlers with TS types derived on the fly at compile time. It also validates data returned from handlers to conform to schemas, reducing the likelihood of accidentally leaking sensitive information. And it's faster than Express, even with validation.