Why is Zod schema-first?
You define a schema (z.object({ email: z.string().email() })) and use it anywhere: in a middleware, in a frontend form, in tests. The schema is the source of truth, not the validation call. This makes it reusable.
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More FAQs in express-validator vs Zod: Which to Use in 2025
Zod for new TypeScript projects and shared frontend/backend schemas. express-validator for existing JavaScript Express projects with a tight integration preference. Both work; Zod is more modern and reusable.
Zod schemas infer TypeScript types directly. const signupSchema = z.object({ email: z.string() }) gives you type SignupInput = z.infer<typeof signupSchema>. express-validator does not infer types; you write them separately.
safeParse returns { success: true, data } or { success: false, error } instead of throwing. Useful in middleware where you want to handle errors gracefully. express-validator uses validationResult which is similar but less composable.
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