Lesson 08 · 11 min
Errors, limits, and API versions
The client should understand what went wrong without reading your code.
11 minLesson 8 of 9Practice includedAsk AI on any point
It's best to return all API errors in one format so the client parses them with one piece of code. There's a standard, Problem Details (RFC 9457): the type application/problem+json and the fields type, title, status, detail. Validation errors add a list of fields. The status stays real: 400, 404, 409, 422 — not 200 with an error message.
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