Why Your TypeScript Code Still Crashes in Production: Validating Data at Runtime Boundaries with Zod

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Mình từng review một incident lúc 2 giờ sáng: service Node.js crash hàng loạt với lỗi TypeError: Cannot read properties of undefined (reading 'toFixed'). Codebase 100% TypeScript, bật strict: true, CI xanh, không có any nào. Vậy mà vẫn sập. Nguyên nhân là bên đối tác đổi field price từ number sang string "12.50", và có record thì trả về null. TypeScript không hề biết chuyện này, vì type chỉ tồn tại lúc compile, còn data thật đến lúc runtime.

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