Why it matters

Bad APIs create support burden and dev friction for years. Good APIs feel effortless. Investment in design pays back constantly.

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The architecture

Consistency: same patterns across endpoints. If some endpoints use IDs in URL and others in body, learners struggle.

Predictability: users can guess API from patterns. Once they know one endpoint, they can use others.

API design principlesConsistentsame patternsPredictableguessableEvolvableadd without breakVersion explicitly; deprecate gradually; document behavior including edge cases
Design principles.
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How it works end to end

REST conventions: nouns not verbs in URLs, standard HTTP methods (GET, POST, PUT, DELETE).

Response consistency: same envelope structure for success and error.

Pagination: standard pattern (offset/limit or cursor-based).

Versioning: URL (/v1/) or header (Accept: application/vnd.api+json;version=1). Explicit either way.