JSON to Zod Schema

Infer a Zod validation schema from any JSON sample. Paste your JSON and get a type-safe Zod schema you can copy directly into your project.

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How it works

• Paste a JSON example representing your expected data shape.
• Click Generate Zod Schema — a ready-to-use Zod schema is produced.
• Copy the schema into your TypeScript project and use it for runtime validation.
• Click Make strict to add .strict() and reject unknown keys.

Usage example

import { z } from 'zod';
import { userSchema } from './schemas/user';

const result = userSchema.safeParse({ name: 'Alice', id: 1 });
if (result.success) {
  console.log(result.data);
} else {
  console.error(result.error.format());
}

About JSON to Zod Schema

Zod is a TypeScript-first schema declaration and validation library that checks your data at runtime and infers types at compile time. Because JSON carries no type information beyond its values, inferring a Zod schema from a JSON sample gives you a fast starting point instead of handwriting validators by hand. This tool performs that inference and outputs a schema you can drop straight into your project.

Use it when you receive data from an external API, a database, or an LLM and want runtime guarantees about its shape. Remember that the inferred schema is only as good as your sample: if the sample is incomplete — missing optional fields, empty arrays, or null values — the generated schema may be too narrow or too wide, so review and adjust it before relying on it in production.