zod-validation
Zod v4 schema validation for TypeScript. Covers primitives, string formats, objects, arrays, unions, coercion, transforms, refinements, parsing, type inference, error customization, JSON Schema, file validation, and metadata. Use when writing schemas, validating input, parsing data, inferring types, or converting schemas with Zod.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/oakoss/agent-skills --skill zod-validation- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads zod-validation automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Zod Validation (v4)
Type-safe schema validation for TypeScript. Zod v4 introduces top-level format functions, z.stringbool(), z.iso.* date formats, z.overwrite() transforms, z.file(), z.toJSONSchema(), getter-based recursive types, .meta(), and the unified error function.
Package: zod (also zod/mini for smaller bundles)
Quick Reference
| Pattern | Usage |
|---|---|
z.object({ ... }) | Define object schemas |
z.string(), z.number() | Primitive types |
z.email(), z.url(), z.uuid() | Top-level string formats (v4) |
z.iso.date(), z.iso.datetime() | ISO date/time formats (v4) |
z.int(), z.float32(), z.int32() | Fixed-width number formats (v4) |
z.templateLiteral([...]) | Template literal type validation (v4) |
z.enum([...]), z.literal() | Enums and literals |
z.union([...]), z.discriminatedUnion() | Union types |
z.array(), z.tuple() | Array and tuple types |
z.record(), z.map() | Key-value collections |
.optional(), .nullable() | Optional and nullable modifiers |
.default(), .catch() | Default values and fallbacks |
.prefault() | Pre-parse default (parsed through schema, v4) |
z.coerce.number() | Type coercion before validation |
z.stringbool() | String-to-boolean parsing (v4) |
.transform(), .overwrite() | Output transforms |
z.pipe() | Chain schemas (output feeds next input) |
.refine(), .superRefine() | Custom validation logic |
.parse(), .safeParse() | Validate and extract data |
z.infer<typeof Schema> | Extract TypeScript type from schema |
z.input<>, z.output<> | Input vs output types with transforms |
z.file() | File instance validation (v4) |
z.toJSONSchema() | Convert schema to JSON Schema (v4) |
.meta(), .describe() | Attach metadata to schemas (v4) |
z.prettifyError() | Human-readable error formatting (v4) |
z.treeifyError() | Structured error tree (replaces .format(), v4) |
z.registry() | Typed schema registry (v4) |
{ error: (issue) => ... } | Unified error customization (v4) |
| Getter-based recursion | Recursive types without z.lazy() (v4) |
z.globalRegistry | Global schema metadata registry (v4) |
z.config(z.locales.en()) | Internationalized error messages (v4) |
Common Mistakes
| Mistake | Fix |
|---|---|
z.string().email() | z.email() (v4 top-level format) |
z.string().url() | z.url() (v4 top-level format) |
Using parse without try/catch | Use safeParse for error handling |
Forgetting .optional() | Add when field may be undefined |
z.any() for unknown data | Use z.unknown() for type-safe unknown |
.transform() for same-type changes | Use .overwrite() (introspectable, v4) |
Missing .min(1) on strings | Empty strings pass z.string() by default |
z.number().parse(Infinity) | z.number() rejects Infinity in v4 |
z.number().safe() for floats | .safe() equals .int() in v4 (no floats) |
z.lazy() for recursive types | Use getter syntax in v4 (retains object methods) |
required_error / invalid_type_error | Use unified error function in v4 |
.refine(fn, (val) => ({ message })) | Function-as-second-arg overload removed; use .superRefine() |
errorMap on schemas | Replaced by error function in v4 |
z.record(z.string()) single arg | v4 requires two args: z.record(z.string(), z.string()) |
.format() / .flatten() on ZodError | Deprecated; use z.treeifyError(err) in v4 |
.default() with input type value | v4 .default() uses output type; use .prefault() for input |
Delegation
Use this skill for Zod schema definition, validation, parsing, type inference, coercion, error formatting, metadata, and JSON Schema conversion. For form integration, delegate to the tanstack-form skill.
References
- Schema Types — primitives, string formats, number formats, template literals, objects, arrays, enums, unions, records, optional, nullable
- Transforms and Parsing — coercion, stringbool, transforms, overwrite, pipe, refinements, parsing, type inference
- Error Handling — unified error function, prettifyError, treeifyError, ZodError, error formatting, internationalization
- Common Patterns — form validation, API responses, environment variables, schema composition, recursive types, branded types
- Metadata and JSON Schema — meta, describe, globalRegistry, toJSONSchema, file validation, Zod Mini
FAQ
What does the zod-validation skill do?
Zod v4 schema validation for TypeScript. Covers primitives, string formats, objects, arrays, unions, coercion, transforms, refinements, parsing, type inference, error customization, JSON Schema, file validation, and metadata. Use when writing schemas, validating input, parsing data, inferring types, or converting schemas with Zod.
How do I install zod-validation?
Run npx skills add https://github.com/oakoss/agent-skills --skill zod-validation in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/zod-validation/ (personal) or .claude/skills/zod-validation/ (project).
Which AI agents can use zod-validation?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is zod-validation safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains zod-validation?
It is published by oakoss in oakoss/agent-skills. It has 195 recorded installs.
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