Zod Expert - CLAUDE.md Rules for Claude Code
Transform Claude into a Zod specialist with deep knowledge of schema design, parsing, refinements, transforms, and TypeScript inference for runtime validation.
Open the source and read safety notes before installing.
Privacy notes
- Rules reference API payloads that may contain secrets; validate and redact sensitive fields before logging parse errors.
Schema details
- Install type
- copy
- Troubleshooting
- No
Full copyable content
You are an expert Zod developer focused on runtime validation with TypeScript.
## Schema design
- Compose small schemas with `z.object`, `z.union`, and `z.discriminatedUnion`.
- Prefer `z.infer<typeof schema>` for shared input/output types.
## Parsing
- Use `safeParse` at boundaries (HTTP handlers, env loaders, config imports).
- Return structured errors with `flatten()` or `format()` for user-facing messages.
## Refinements
- Put cross-field rules in `.superRefine` with explicit issue paths.
- Keep transforms separate from validation when side effects are possible.About this resource
Zod Expert
Use these rules when designing or reviewing Zod schemas.
Boundary validation
Validate untrusted input at system boundaries: HTTP bodies, query params, environment variables, and webhook payloads. Parse once, then work with typed data internally.
Composable schemas
Build schemas from reusable pieces. Share primitives across API, forms, and background jobs so validation rules stay consistent.
Error handling
Prefer safeParse over parse in production code paths. Format errors for operators without leaking raw payloads that may contain secrets.
References
Source citations
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[](https://heyclau.de/entry/rules/zod-expert)How it compares
Zod Expert - CLAUDE.md Rules for Claude Code side by side with 3 alternatives on trust, install, platform support, and disclosed safety notes — all from reviewed registry metadata.
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|---|---|---|---|---|
| Trust | ||||
| Install risk | Review first | Review first | Review first | Review first |
| Notes | Safety · Privacy ✓ | Safety ✓ Privacy ✓ | Safety · Privacy · | Safety · Privacy ✓ |
| Category | rules | rules | rules | rules |
| Source | source-backed | source-backed | source-backed | source-backed |
| Author | jaso0n0818 | JSONbored | jaso0n0818 | jaso0n0818 |
| Added | 2026-06-17 | 2025-09-26 | 2026-06-13 | 2026-06-13 |
| Platforms | Claude Code | Claude Code | Claude Code | Claude Code |
| Source repo | — | — | — | — |
| Safety notes | — missing | ✓Recommendations may include shell commands, package installs, or file edits; review and run any suggested changes yourself instead of applying them unverified. | — missing | — missing |
| Privacy notes | ✓Rules reference API payloads that may contain secrets; validate and redact sensitive fields before logging parse errors. | ✓Auditing reads source, configuration, and logs that may contain secrets or personal data; keep any captured sensitive values out of shared audit reports. | — missing | ✓Rules reference JWT tokens and OAuth2 authentication middleware; signing keys and client secrets must be stored in environment variables or a secrets manager, not in source code. |
| Prerequisites | — none listed | — none listed | — none listed | — none listed |
| Install | — | — | — | — |
| Config | — | — | — | — |
| Citations | ||||
| Claim | Unclaimed | Unclaimed | Unclaimed | Unclaimed |
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