🔄 JSON to Zod Schema Generator

// Paste JSON data on the left to auto-generate Zod Schema code

What Can JSON to Zod Schema Do?

The JSON to Zod Schema Generator is an online tool for TypeScript developers that automatically converts JSON data into Zod validation schema code. Zod is the most popular runtime type validation library in the TypeScript ecosystem. This tool saves you from the tedious work of writing schemas manually, generating ready-to-use validation code with one click.

Core Features

• Auto Type Inference: Automatically infers Zod types from JSON values — string/number/boolean/array/object/null all covered
• Nested Object Support: Deeply nested JSON objects automatically generate corresponding z.object() nested structures
• Optional Field Strategy: Flexible control over field optionality — all required, only undefined optional, or all optional
• Enum Inference: Automatically identifies short string arrays and generates z.enum() union types
• Date Handling: Supports automatic conversion of ISO date strings to z.coerce.date() or z.string().datetime()

How to Use

1. Paste your JSON data into the input box, or click "Load Example" to see a demo; 2. Configure generation options like schema name, optional field strategy, number precision; 3. The tool automatically generates Zod Schema code in real-time; 4. Click "Copy Code" to copy the schema to clipboard, or "Download File" to save as .ts; 5. Import zod in your TypeScript project and paste the code to use.

Use Cases

API Response Validation

Backend developers receive JSON sample responses and quickly generate Zod Schemas, combining with z.infer to auto-derive TypeScript types for runtime request/response validation.

Form Validation

Frontend developers generate Zod Schemas from form data structures, combining with React Hook Form for real-time field validation and error messages.

Config File Validation

DevOps engineers use Zod Schemas to validate JSON/YAML config file formats, preventing deployment failures from configuration errors.

Extended Knowledge

Zod is a TypeScript-first schema declaration and validation library. Its core advantage is "Write Once, Validate Everywhere" — define a schema once for both runtime validation and TypeScript type inference. Lighter than Joi, more TypeScript-friendly than Yup. Zod supports advanced features like transform/refine/preprocess for data cleaning and custom validation. Recommended to use with z.infer to avoid duplicating type and validation logic.