validating-string-formats

Zod v4 provides top-level string format validators like z.email() and z.uuid() that parse and enforce correctness against standard formats. Use z.email() for email validation and z.uuid() for UUID strings in schemas for forms, API requests, or data intake pipelines.

Zod v4 supports email, UUID, ISO datetime, URL, IPv4, IPv6, JWT, Base64, and cryptographic hashes (e.g., SHA256). Apply z.iso.datetime(), z.url(), z.ipv4(), z.ipv6(), z.jwt(), z.base64(), and z.hash() validators to enforce type-safe string validation in data processing workflows.

Yes, Zod v4 string validators support transformation methods including trim, toLowerCase, and toUpperCase for input normalization. Chain these transformations with format validators to clean and standardize user-provided strings before validation.

Zod v4 codecs enable custom (de)serialization for strings. Use codecs alongside format validators to define branded types and safe encode/decode logic for specialized string handling in APIs and pipelines.

Zod v4's top-level string format validators are optimized for speed. Use bulk array validation with z.array() wrapping format validators like z.email() to efficiently validate multiple strings in batch data intake and query parameter processing.

Zod v4 supports customizable error handling for validation failures. Pass error messages and refine validation logic with format validators to provide clear, context-specific feedback when strings don't match expected formats like email or UUID.