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Mixed Naming Conventions in APIs Can Cause Silent Data Bugs in Production

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Inconsistent use of camelCase and snake_case across codebases — such as between a Python backend and a TypeScript frontend — can cause fields to be silently misread or written as null, with no error thrown. The bug often survives code review because each side of the codebase appears internally consistent, masking the mismatch at the boundary. The root cause is the absence of a dedicated serialization or mapping layer that enforces a single naming convention at the API boundary. Developers are advised to pick one convention per boundary layer and validate it with automated tests, such as snapshotting a real API response in CI to catch unexpected field name changes. Common pitfalls include inconsistent handling of acronyms during case conversion and filesystem case-sensitivity differences between macOS and Linux environments.

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