Docs, Testing & Building

A good design only matters once it ships. This final module connects the dots: describe the API with a spec, prove it works with tests, and implement it cleanly in TypeScript.

From design to running service

flowchart LR
  D[Design: resources, methods, errors] --> S[Spec: OpenAPI]
  S --> I[Implement: TypeScript + Hono]
  I --> T[Test: unit / integration / contract]
  T --> Doc[Docs from the spec]
  Doc --> D

Spec, implementation, and tests reinforce each other

The spec is the hinge: it documents the contract for consumers, generates client code and docs, and gives your tests something to check the implementation against.

What this module covers

• OpenAPI — describing the API as a machine-readable contract.
• Testing APIs — unit, integration, and contract tests.
• Building with Hono — a cohesive TypeScript implementation.
• Best-practices recap — a checklist over everything you have learned.

🌐 The spec is the contract

Whether you write the OpenAPI document first (spec-first) or generate it from code (code-first), treat it as the single source of truth for what the API promises. Consumers, docs, mock servers, and contract tests all flow from it — a drifting or absent spec is how integrations quietly break.

What role does the OpenAPI spec play across docs, tests, and clients?

It replaces the implementation It is the single source of truth for the contract that the others derive from It is only for generating docs It is optional decoration

Why does a design only matter once it ships?

Designs are unimportant The value is realized when a documented, tested implementation runs Shipping removes the need for design Tests replace design

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