DriftGuard is a tool that monitors third-party APIs for silent schema changes, the kind that return 200 OK while quietly breaking your integration. This blog covers the building of DriftGuard in public: technical decisions, lessons learned, and the occasional post-mortem on API changes that have broken real production systems. If you've ever spent a Friday night debugging why your data looks wrong only to discover an upstream API quietly renamed a field, this blog is for you.
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Marcus Chen
The weight_lbs to weight_kg example is a good one. Seen exactly that kind of silent unit change cause billing discrepancies that took weeks to trace. Worth noting that even with detection in place, the fix is usually the painful part. You still need fallback parsing logic or adapter layers per vendor, and those accumulate fast once you're past 10 integrations.