TTULAKITO
Developer

JSON to Zod Schema

Generate Zod schemas from JSON payloads for runtime validation.

All tools

JSON

Zod schema

import { z } from "zod";

export const schema = z.object({
  id: z.number(),
  name: z.string(),
  active: z.boolean(),
  tags: z.array(z.string()),
  profile: z.object({
    email: z.string()
  })
});

export type Schema = z.infer<typeof schema>;

Frequently asked questions

Does the generated Zod schema include runtime coercion?
Most generators emit strict types like z.string() without coercion, so "42" will not pass as a number. Add z.coerce.number() or .transform() manually when your input may arrive as strings, such as from URL query params.
How are optional and nullable fields represented in Zod?
Use .optional() when the key may be missing, .nullable() when the value may be null, and .nullish() for both. The three are not interchangeable and the generator picks one based on what it sees in the sample.
Can a Zod schema infer the matching TypeScript type?
Yes - z.infer<typeof MySchema> gives you the static type that the schema validates, so you do not maintain a separate TS interface. That is the main reason teams reach for Zod over plain JSON Schema.