Silent API payload shrinkage caused days of undetected service failure

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A developer's video downloader service silently degraded for several days after a third-party API began returning incomplete JSON responses, omitting key media URL fields while still sending HTTP 200 status codes. Because every monitoring layer only checked for successful responses rather than validating required fields, no alerts were triggered and all health checks passed normally. Users experienced 30-second waits instead of one-second downloads, a missing MP3 option, and broken photo post handling, yet the root cause pointed away from the developer's own infrastructure. The issue was finally identified by directly comparing the API response structure against the fields the client actually needed, revealing that 'direct' and 'audio' fields had vanished entirely. The incident highlighted a common blind spot: fallback logic and surface-level response checks can mask upstream data degradation that never produces an error code.

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