Schema plus types
Every object gets an exported schema and a matching type via z.infer.
JSON to Zod Schema Generator
Create runtime validation schemas and TypeScript types from example JSON.
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Result
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About this tool
How the JSON to Zod Schema works
Generate a Zod schema and inferred TypeScript types from JSON. Detects integers, ISO dates, UUIDs, URLs, optional and nullable fields.
How to use the JSON to Zod Schema
- Paste JSON.
- Set the root name.
- Copy the schema into your TypeScript project and import z from "zod".
JSON to Zod Schema example
{"id":7,"name":"aarav","createdAt":"2026-03-14T09:30:00Z","tags":["a"]}import { z } from "zod";
export const UserSchema = z.object({
id: z.number().int(),
name: z.string(),
createdAt: z.string().datetime({ offset: true }),
tags: z.array(z.string()),
});
export type User = z.infer<typeof UserSchema>;When to use it
- Validating API responses in Next.js or React apps.
- Checking request bodies in tRPC or Express handlers.
- Typing form data with React Hook Form.
Tip: Use Schema.parse() where data enters your app, then rely on the inferred type everywhere else.
Format detection
ISO date-times, dates, UUIDs and URLs get .datetime(), .date(), .uuid() and .url().
Optional vs nullable
Missing keys become .optional(); null values become .nullable().
Reusable nested schemas
Nested objects become their own schemas, declared before they are used.
FAQ
Common questions
Which Zod version does it target?
Zod 3. String helpers like .datetime() and .date() need Zod 3.22 or later.
Why use Zod instead of only TypeScript types?
TypeScript types disappear at runtime; Zod validates real data from APIs, forms and environment variables.
How are integers detected?
Whole numbers in every sample become z.number().int(); any decimal makes the field z.number().
Is my JSON uploaded?
No, the schema is generated in your browser.
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