olorehq/olore/3

Zod v3 Documentation

Zod is a TypeScript-first schema declaration and validation library — declare a validator once and Zod infers the static type. This package covers v3 only (final release 3.25.76, July 2025; v3 is frozen).

If the user is on Zod 4, use `olore-zod-latest` instead. The v4 API differs substantially — error customization, z.treeifyError, codecs, z.toJSONSchema, and z.compile are all v4-only, and several v3 methods were renamed or removed.

Quick Reference

When to use

Use this skill when the user asks about:

• Zod 3 schema definition and composition, and is explicitly on v3
• .parse() / .safeParse() and v3 parsing behaviour
• v3 type inference (z.infer, z.input, z.output)
• .refine(), .superRefine(), .transform(), .preprocess() in v3
• ZodError, ZodIssue, issue codes, and custom error maps in v3
• Migrating from Zod 1 or 2 up to Zod 3
• Confirming whether an API exists in v3 vs v4

How to find information

1. contents/home.md answers most questions — it is the full v3 reference; search

within it rather than reading it whole

1. Error-related questions go to contents/ERROR_HANDLING.md
2. For a Zod 3 → Zod 4 migration, switch to the olore-zod-latest skill and read

its v4/changelog.mdx