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nestjs swagger openapi zod

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Accepted Answer
March 8, 2026 Score: 2 Rep: 108 Quality: Medium Completeness: 50%

Use z.coerce.date() with a custom transformer, or use z.string().datetime() with serialization

The cleanest approach is to transform the Date to a string at the schema level, which satisfies both runtime validation and Swagger generation.

import { z } from "zod"
import { createZodDto } from "nestjs-zod"
export const registerResponseSchema = z.object({
  id: z.string(),
  username: z.string(),
  created_at: z.preprocess(
    (val) => (val instanceof Date ? val.toISOString() : val),
    z.string().datetime()
  ),
})
export class RegisterResponse extends createZodDto(registerResponseSchema) {}