Convert Tools

JSON to Zod Schema Generator

Turn raw JSON into ready-to-paste Zod schemas with nested objects, arrays, unions, and optional TypeScript inferred types.

JSON Input

Paste any JSON object or array.

Generated Zod Schema

Copy the output into your TypeScript project.

// Your generated Zod schema will appear here

What this tool generates

  • • z.object() schemas for nested JSON objects
  • • z.array() schemas for arrays
  • • z.union() output for mixed arrays
  • • Optional inferred TypeScript type export

Good use cases

  • • Turning API responses into runtime validators
  • • Bootstrapping form or tRPC schemas
  • • Creating quick examples for docs and prototypes
  • • Deriving z.infer types from real payloads

Privacy

Everything runs locally in your browser. Your JSON is not uploaded to a server.

What Is a JSON to Zod Schema Generator?

A JSON to Zod schema generator automatically converts raw JSON data into Zod validation code — the TypeScript-first schema library used throughout the Node.js ecosystem. Instead of hand-writing z.object(), z.array(), and z.union() definitions from scratch, you paste any valid JSON and the converter produces production-ready Zod schema code in milliseconds.

The tool runs entirely in your browser. No JSON is ever sent to a server, making it safe for sensitive API payloads, internal data models, and proprietary schemas.

How to Convert JSON to Zod Schema

  1. 1 Paste your JSON — copy any JSON object or array into the left panel. Use the Sample button to load an example if you want to explore the output format first.
  2. 2 Set the type name — enter a Type Name such as User or ApiResponse. This becomes the exported TypeScript interface name when Include inferred TypeScript type is checked.
  3. 3 Name your schema variable — optionally fill in the Schema Variable field (e.g. UserSchema). If left blank, the tool auto-generates one from the type name.
  4. 4 Review the generated schema — the right panel updates in real time. Check the output for z.nullable(), z.union(), and nested z.object() calls that reflect your data structure.
  5. 5 Copy or download — click Copy to grab the schema to clipboard, or Download to save a .ts file named after your schema variable.

Common Use Cases

API response validation

Paste a real REST or GraphQL response to instantly generate a Zod validator. Add it to your data-fetching layer to catch schema drift at runtime before it reaches the UI.

tRPC input and output schemas

tRPC requires Zod schemas for every procedure's input and output. Generate a starting schema from sample data, then refine optional fields and constraints before wiring it in.

Form validation with React Hook Form

When using zodResolver with React Hook Form or SvelteKit's Superforms, convert your initial data shape to a Zod schema in seconds.

Bootstrapping TypeScript types

Enable Include inferred TypeScript type to get a z.infer<typeof Schema> export alongside the validator. One step replaces both manual interface writing and schema authoring.

Documentation and prototyping

Quickly generate example schemas for tutorials, blog posts, or internal docs without hand-crafting Zod syntax. Paste sample fixtures and get clean, readable code.

Onboarding new APIs

When integrating a third-party API for the first time, log a sample response and run it through the converter to create a validator in under a minute, with no dependency on the provider's OpenAPI spec.

Frequently Asked Questions

Does this tool handle nested objects and arrays?

Yes. The converter recursively processes nested JSON objects and arrays of any depth, generating proper z.object() and z.array() calls at each level.

How are null values handled?

Fields with a null value are mapped to z.nullable(z.unknown()) since the underlying type cannot be inferred from null alone. You can refine these manually after copying the output.

What happens when an array contains mixed types?

Mixed arrays (e.g. ["hello", 42, true]) are represented as z.array(z.union([...])), listing every distinct type found in the array.

Can I use the output directly in production?

The generated schema is a solid starting point. You should review optional fields (fields that may be absent in some responses) and add .optional() where needed, as JSON sample data represents one snapshot and may not capture every nullable or optional field in the actual API contract.

Does it generate TypeScript types automatically?

Yes — check the Include inferred TypeScript type option and the output will include export type YourType = z.infer<typeof YourSchema> below the schema definition.

Is my JSON data sent anywhere?

No. All processing happens locally in your browser using JavaScript. Nothing is transmitted to any server, so you can safely use this with confidential or proprietary data.

What version of Zod does the output target?

The output uses the standard Zod v3 API (import { z } from "zod"), which is compatible with all Zod 3.x releases including the latest.