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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.
E2E test architecture and patterns with Playwright. Use when designing test suites, structuring Page Object Models, planning CI sharding strategies, setting up authentication flows, or organizing tests with tags and annotations. Use for test architecture, accessibility auditing with axe-core, network mocking strategies, visual regression workflows, HAR replay, and storageState authentication patterns. For Playwright API details, browser automation, or web scraping, use the playwright skill instead.
Playwright browser automation API, web scraping, and tooling. Covers locator strategies, assertions, API testing, stealth mode, anti-bot bypass, authenticated sessions, screenshots/PDFs, Docker deployment, configuration, debugging, and MCP integration with AI agents. Prevents documented errors including CI timeout hangs, extension testing failures, and navigation issues. Use when automating browsers, scraping protected sites, bypassing bot detection, generating screenshots/PDFs, configuring Playwright Test, troubleshooting Playwright errors, or learning Playwright API patterns. For E2E test architecture, Page Object Models, CI sharding strategies, or test organization patterns, use the e2e-testing skill instead.
Type-safe, file-based React routing with route loaders, search params validation, code splitting, preloading, navigation, route context, and TanStack Query integration. Use when setting up file-based routing, adding search params validation, implementing route loaders, code splitting routes, configuring virtual file routes, protecting routes with auth guards, or fixing type registration errors. Use for router setup, navigation patterns, URL state management, data loading.
TanStack Table v8 headless data tables for React. Covers column definitions, sorting, filtering (fuzzy/faceted), server-side pagination with TanStack Query, infinite scroll, virtualization (TanStack Virtual), column/row pinning, row expanding/grouping, column resizing, and reusable Shadcn-styled components. Prevents 15 documented errors including infinite re-renders, React Compiler incompatibility, and server-side state mismatches. Use when building data tables, fixing table performance, implementing server-side pagination, adding filtering/sorting, or debugging table state issues.
Drizzle ORM for type-safe SQL with PostgreSQL, MySQL, and SQLite. Use when defining schemas, writing queries, managing relations, running migrations, or using drizzle-kit. Use for drizzle, orm, schema, query, migration, pgTable, relations, drizzle-kit, drizzle-zod.
TanStack Form v1 headless form state management for React. Covers field validation (sync/async, debouncing), form submission, array fields, linked fields, form composition patterns, and Standard Schema integration (Zod, Valibot, ArkType, Yup). Use when building forms with complex validation, implementing reusable form components, handling dynamic field lists, managing form state, or integrating validation libraries.
| name | zod-validation |
| description | 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. |
| license | MIT |
| metadata | {"author":"oakoss","version":"1.1","source":"https://zod.dev"} |
| user-invocable | false |
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)
| 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) |
| 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 |
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.
