Valibot

valibot is the open source schema library for TypeScript with bundle size, type safety and developer experience in mind. You can use valibot to define the API specification of typed-api-spec.

import { v } from "valibot";

const Spec = {
  "/users/:id": {
    get: {
      params: v.object({ id: v.string() }),
      query: v.object({ page: v.string().optional() }),
      headers: v.object({ "x-api-key": v.string() }),
      responses: {
        200: {
          headers: v.object({ "content-type": v.literal("application/json") }),
          body: v.object({ userNames: v.array(v.string()) }),
        }
      },
    },
  },
} satisfies ZodApiEndpoints

Using server integration

If you use express, you can use official integration to validate request parameters based on the API specification. See the express page for more information.