String Validators in Zod

From the Zod cheat sheet · String Validation · verified Jul 2026

Length, format, and pattern validators for strings

typescript

z.string().min(3);
z.string().max(20);
z.string().length(10);
z.email();
z.url();
z.uuid();
z.string().regex(/^[a-z]+$/);

💡 In Zod 4, format validators like z.email() are top-level functions, not z.string().email()

⚡ Chain string methods to build complex validators — they all return ZodString

📌 Use z.iso.datetime() for ISO 8601 strings and z.coerce.date() to convert to Date objects

🟢 String transformations like .trim() and .toLowerCase() apply during parsing

stringvalidationemailurl

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