Zod is a TypeScript-first schema validation library. You define a schema once and Zod infers the static TypeScript type automatically. It is widely used with React Hook Form, tRPC, and Next.js for validating API responses, form inputs, and environment variables.

What does the JSON to Zod converter output?

The converter outputs a Zod schema (e.g., z.object({ name: z.string(), age: z.number() })) exported as a const, plus an inferred TypeScript type exported via z.infer .

JSON to Zod Schema Converter

Generate Zod schema definitions from JSON objects and API responses with AI — free, no login required.

Zod is the most popular TypeScript validation library — but writing schemas manually for every API response is tedious. Paste any JSON object and instantly get a Zod schema with inferred types and a ready-to-use TypeScript type via z.infer<>.

Paste your code, then click Convert

Zod Schema

How to use this tool?

This online converter harnesses AI to generate Zod schema definitions from JSON data. Follow these steps:

Type or paste your JSON object into the input box provided.
Click the "Convert" button to generate the Zod schema with correct types.
View the Zod schema and inferred TypeScript type in the output box, ready to use in your project.

Example: Simple Function

JSON

// JSON
{
  "name": "Alice",
  "age": 30,
  "active": true
}

Zod Schema

import { z } from 'zod';

export const RootSchema = z.object({
  name: z.string(),
  age: z.number(),
  active: z.boolean(),
});

export type Root = z.infer<typeof RootSchema>;

How to Convert JSON to Zod

When you receive a JSON API response, you need both a TypeScript type and a Zod schema to safely use it in your application. Writing Zod schemas by hand for large JSON objects means mapping every field to its Zod type — tedious and error-prone.

The JSON to Zod converter infers a Zod schema directly from JSON data. Paste any JSON object or API response and get a Zod schema with correct types, optional fields, and nested schemas.

Why Use a JSON to Zod Converter?

→Validate API responses at runtime against the actual response shape
→Generate Zod schemas from example API payloads instantly
→Add runtime validation to external data sources without manual schema writing
→Combine with JSON to TypeScript for both types and validation from one JSON source

What the JSON to Zod Converter Handles

Primitive types (z.string, z.number, z.boolean)

Null values (z.null or .nullable())

Object schemas (z.object)

Array schemas (z.array)

Nested object schemas

Union types from mixed arrays

Optional fields detection

String format detection (email, URL, date)

Integer vs float detection

Literal value schemas

Recursive structures

Empty object and array handling

Frequently Asked Questions

What is Zod?

Zod is a TypeScript-first schema validation library. You define a schema once and Zod infers the static TypeScript type from it automatically. It is widely used with React Hook Form, tRPC, Next.js, and API validation to ensure data matches expected shapes at runtime.

What does the converter output?

The output includes a named Zod schema const (e.g. export const UserSchema = z.object({...})) and an exported TypeScript type inferred from it (export type User = z.infer<typeof UserSchema>), plus the required import statement.

Does it handle nested JSON objects?

Yes. Nested JSON objects are converted to nested z.object() calls. Arrays become z.array(z.string()), z.array(z.object({...})), etc. based on their element types.

Do I need to install Zod?

Yes — in your project run: npm install zod. The generated schema uses z from 'zod' which you import at the top of your file.

Is the tool free?

Yes, completely free with no account required.

How do I create a Zod schema from a JSON object?

Paste the JSON object into the converter and click Convert. The tool infers types from the JSON values and generates a z.object() schema with the correct Zod type for each field. Copy the output directly into your TypeScript file.

How do I derive a TypeScript type from a Zod schema?

Use z.infer: type MyType = z.infer<typeof MySchema>. This gives you a TypeScript type that exactly matches your Zod schema — no duplicate type definitions.

What Zod type does a JSON null value produce?

A JSON null value produces z.null() as a standalone schema, or .nullable() when combined with another type. Fields that are sometimes null are typed as z.string().nullable(), for example.

Can I use a Zod schema to validate environment variables?

Yes. This is a common pattern. Define a Zod schema for your env vars and call schema.parse(process.env) at startup. Invalid or missing env vars throw immediately with a clear error, rather than failing silently at runtime.

Does the JSON to Zod converter generate .strict() schemas?

By default, z.object() allows unknown keys (passthrough behavior). Adding .strict() rejects objects with keys not in the schema. The converter generates standard schemas — add .strict() manually if you want to reject unknown fields.