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Backend / Error Handling / Defensive Programming Vs Fail Fast / TL;DR

Defensive Programming Vs Fail Fast · TL;DR

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TL;DR

LayerStrategyExample
API/ControllersDefensiveValidate input, return user-friendly errors
Application ServicesMixedTransform external data (defensive), enforce business rules (fail-fast)
Domain EntitiesFail-FastEnforce invariants strictly
External IntegrationsDefensiveHandle unreliable data, provide fallbacks
Critical CalculationsFail-FastEnsure correctness, fail loudly on errors

Key Takeaway: Balance resilience (defensive) with correctness (fail-fast) based on the layer and criticality of the operation.

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