JSON to Zod Schema

JSON Input
Zod Schema
export const UserSchema = z.object({
  id: z.number().int(),
  name: z.string(),
  email: z.string(),
  age: z.number().int(),
  active: z.boolean(),
  score: z.number(),
  tags: z.array(z.string()),
  address: addressSchema,
  metadata: z.null().optional(),
});

export const addressSchema = z.object({
  street: z.string(),
  city: z.string(),
  zip: z.string(),
});
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What This Tool Does

JSON to Zod Schema is built for deterministic developer and agent workflows.

Convert JSON to Zod schema definitions with optional/required inference, coerce mode, and nested schema support.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

Best Path For Builders

Dedicated API endpoint

Deterministic outputs, machine-safe contracts, and production-ready examples.

Dedicated API

https://aidevhub.io/api/json-to-zod/

OpenAPI: https://aidevhub.io/api/openapi.yaml

GET /api/json-to-zod/ GET json-to-zod
POST /api/json-to-zod/ POST json-to-zod

Unified Runtime API

https://aidevhub.io/api/tools/run/?toolId=json-to-zod&a=...

GET and POST are supported at /api/tools/run/ with identical validation and limits.

Limit: req / s, input max 128 KB.

How to Use JSON to Zod Schema

  1. 1

    Paste your JSON data

    Input a JSON object or array in the left panel. The tool parses the structure and infers Zod schema types: strings become z.string(), numbers become z.number(), booleans become z.boolean(), and null becomes z.null().

  2. 2

    Configure schema options

    Set the root schema name (default: RootSchema). Toggle optional fields with .optional() for nullable values. Enable .strict() mode to reject unknown keys. Choose between z.object() and z.record() for dynamic key shapes.

  3. 3

    Review generated Zod schemas

    The right panel shows composable Zod schemas ready for TypeScript validation. Nested objects become separate named schemas. Copy the output into your project for runtime type checking with full TypeScript inference.

Frequently Asked Questions

What is Zod and why would I use it?
Zod is a TypeScript-first schema validation library that lets you define and validate data shapes at runtime. It's perfect for validating API responses, form submissions, and function arguments. Unlike TypeScript interfaces, Zod schemas work at runtime to catch invalid data before it causes errors.
How does optional/required inference work?
The tool analyzes your JSON and infers which fields might be optional (nullable) based on null values. If a field is null in your JSON, the generated Zod schema marks it as optional(). You can toggle this with the 'Infer optional' option.
What is coerce mode?
Coerce mode uses z.coerce.number() instead of z.number(), which automatically converts string inputs to numbers if possible. This is useful when parsing form data or query parameters where all inputs are strings but you need numbers.
How do nested objects work in the generated schema?
Nested objects are converted into separate Zod schemas that reference each other. The root schema imports or directly uses child schemas. This keeps your code modular and reusable.
Can I use this in production?
Yes, absolutely. The generated Zod schemas are production-ready. Copy the output into your TypeScript codebase, import zod, and use the schemas to validate incoming data at runtime.