zod-prisma-gen

A simple Prisma generator that creates Zod validation schemas. No bloat, no paid tiers.

Installation

npm install zod-prisma-gen zod

Usage

Add the generator to your schema.prisma:

generator zod {
  provider = "zod-prisma-gen"
  output   = "./generated/zod"
}

Run Prisma generate:

npx prisma generate

Import and use your schemas:

import { UserSchema, Role } from './generated/zod';

const user = UserSchema.parse({
  id: 1,
  email: '[email protected]',
  name: 'John',
  role: 'USER',
});

Configuration

| Option | Default | Description | |--------|---------|-------------| | output | ./generated/zod | Output directory | | multipleFiles | false | Generate one file per model | | coerceDate | true | Use z.coerce.date() instead of z.date() |

generator zod {
  provider      = "zod-prisma-gen"
  output        = "./generated/zod"
  multipleFiles = "true"
  coerceDate    = "false"
}

Type Mapping

| Prisma | Zod | |--------|-----| | String | z.string() | | Int | z.number().int() | | Float | z.number() | | Boolean | z.boolean() | | DateTime | z.coerce.date() | | BigInt | z.bigint() | | Decimal | z.string() | | Json | z.unknown() | | Bytes | z.instanceof(Uint8Array) | | Enum | z.enum([...]) |

Example

Given this Prisma schema:

enum Role {
  USER
  ADMIN
}

model User {
  id        Int      @id @default(autoincrement())
  email     String   @unique
  name      String?
  role      Role     @default(USER)
  createdAt DateTime @default(now())
  posts     Post[]
}

Generates:

import { z } from 'zod';

export const RoleSchema = z.enum(['USER', 'ADMIN']);
export type Role = z.infer<typeof RoleSchema>;

export const UserSchema = z.object({
  id: z.number().int(),
  email: z.string(),
  name: z.string().nullable(),
  role: RoleSchema.default('USER'),
  createdAt: z.coerce.date(),
});
export type User = z.infer<typeof UserSchema>;

Notes

• Relations are omitted (not needed for input validation)
• Auto-generated defaults (@default(autoincrement()), @default(now()), @default(uuid())) are skipped
• Static defaults are included with .default()

License

MIT