🔄 JSON to Zod Schema Generator
Free online tool to convert JSON data into Zod validation schema code. Supports nested objects, arrays, optional fields, and union type inference.
Zero Dependencies · Works Offline📝 Input JSON
⚙️ Generation Options
📦 Generated Output
// 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
❓ FAQ
What is Zod?
Zod is a TypeScript-first schema validation library that validates data types at runtime while automatically inferring TypeScript types. It's lighter than Joi/Yup and deeply integrated with TypeScript.
Can the generated Zod Schema be used directly?
Yes. The generated code includes complete z.object/z.array/z.string Zod API calls. Just copy it to your TypeScript project, import zod, and use it.
What Zod type mappings are supported?
string→z.string(), number→z.number(), boolean→z.boolean(), null→z.null(), array→z.array(), object→z.object(), optional→z.optional(), enum→z.enum(), date strings→z.coerce.date(), etc.
How are nested objects and arrays handled?
Nested objects automatically generate z.object() nested structures, arrays generate z.array() with element type inference. Supports multi-level nesting.
Are optional fields supported?
Yes. You can set global strategy: all fields optional, only undefined fields optional, or all required.
Is my data safe?
Completely safe. This tool runs 100% in the browser. Your JSON data is processed only in local memory, never uploaded to any server.