type-safety-validationlisted
Install: claude install-skill aiskillstore/marketplace
# Type Safety & Validation
## Overview
End-to-end type safety ensures bugs are caught at compile time, not runtime. This skill covers Zod for runtime validation, tRPC for type-safe APIs, Prisma for type-safe database access, and modern TypeScript features.
**When to use this skill:**
- Building type-safe APIs (REST, RPC, GraphQL)
- Validating user input and external data
- Ensuring database queries are type-safe
- Creating end-to-end typed full-stack applications
- Migrating from JavaScript to TypeScript
- Implementing strict validation rules
## Core Stack
### 1. Zod - Runtime Validation
```typescript
import { z } from 'zod'
// Define schema
const UserSchema = z.object({
id: z.string().uuid(),
email: z.string().email(),
age: z.number().int().positive().max(120),
role: z.enum(['admin', 'user', 'guest']),
metadata: z.record(z.string()).optional(),
createdAt: z.date().default(() => new Date())
})
// Infer TypeScript type from schema
type User = z.infer<typeof UserSchema>
// Validate data
const result = UserSchema.safeParse(data)
if (result.success) {
const user: User = result.data
} else {
console.error(result.error.issues)
}
// Transform data
const EmailSchema = z.string().email().transform(email => email.toLowerCase())
```
**Advanced Patterns**:
```typescript
// Refinements
const PasswordSchema = z.string()
.min(8)
.refine((pass) => /[A-Z]/.test(pass), 'Must contain uppercase')
.refine((pass) => /[0-9]/.test(pass), 'Must contain number')
// Di