Building Against Real APIs Is Nothing Like Reading the Docs

The developer says the hardest part of API integration is not authentication or making requests, but interpreting real-world responses that differ from the docs.

Different services often use inconsistent data formats, event definitions, timestamp handling, and edge cases, making integration far more complex than expected.

Engineers need to plan for OAuth, pagination, rate limits, error handling, and other production realities beyond simple endpoint calls.

The piece underscores that when working with external systems, teams should design for mismatches and undocumented behavior instead of trusting documentation alone.