zod-validation-utilities

To validate untrusted API input, define a Zod v4 schema at your boundary and apply safeParse workflows to coerce incoming data into strongly typed TypeScript values. This process catches runtime errors predictably before services operate on the data.

Yes, you can use Zod coercion to normalize string and date inputs. By applying z.coerce.*, preprocess, and transforms, you can convert incoming untrusted runtime data into normalized, strongly typed values at service boundaries.

The best way to handle cross-field validation is using Zod's refine and superRefine checks. These allow you to enforce cross-field invariants and generate custom issues within your ZodError output for predictable error formatting.

Zod validation works seamlessly with React Hook Form for type-safe form inputs. You can integrate schemas using zodResolver to parse and enforce form inputs at service boundaries while maintaining full TypeScript inference.

You can perform async validation for database checks by defining async Zod schemas. This allows you to verify untrusted runtime data against external databases during the safeParse workflow, ensuring data integrity before processing.