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Flutter ZIP-Code Autofill: Avoiding Common Bugs in Production

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A developer built ZIP-code autofill for AI US Citizenship Test 2026, a Flutter app for green card holders, to replace a set of state-specific dropdowns during onboarding. The first version suffered from bugs found by real users, including treating ZIP codes as integers, which dropped leading zeros, and firing lookup requests on every keystroke. The article describes a hardened pattern that keeps ZIP codes as strings, accepts ZIP+4 input by normalizing to five digits, and debounces lookups until the input is complete and valid. It also covers a race condition where a stale response overwrote a corrected lookup, which is fixed with a generation counter that discards outdated results. The developer shares the approach so other engineers can avoid these pitfalls.

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