API Documentation

API documentation is technical writing for developers. It's the difference between an API that developers discover and adopt, and one that gets forked because the official docs are mystifying. In 2026, API docs mean: interactive Swagger UI / Redoc interfaces (auto-generated from OpenAPI specs), Getting Started guides (copy-paste in 5 minutes), runnable code examples (Node.js, Python, cURL, Go), and troubleshooting sections (common errors + solutions). The best docs are spec-first: OpenAPI YAML/JSON is the contract, docs are auto-generated from it. No drift, no stale examples. Technical writers paired with backend engineers create developer joy: clear parameter descriptions, response schemas, error codes that teach, SDKs generated automatically. Bad docs cost companies millions in support tickets and developer churn. The skill spans both writing (clear, concise microcopy) and tooling (OpenAPI, Redocly, ReadMe, Stoplight, Mintlify). Developers who can write docs are rare; those who can write docs + understand APIs are gold.