What is JSON to Zod with Custom Validation?
This tool converts JSON data into Zod schemas with customizable validation rules. Zod is a TypeScript-first schema declaration and validation library. This generator automatically infers types from JSON values and allows you to add custom validations like .min(), .max(), .email(), .url(), .regex(), and more.
How to Use
- Paste your JSON data into the input area
- Set the schema name (e.g., UserSchema)
- Click "Show Validation Options" to customize validation rules
- Configure string length limits, number ranges, array sizes, and auto-detection options
- Click "Generate" and copy the output into your TypeScript project
Why Use This Tool?
Tips & Best Practices
- Use realistic sample data — type inference depends on actual values
- Enable auto-detection for emails, URLs, and datetimes to get better validation
- Set appropriate min/max values for your use case
- The generated schema includes TypeScript type inference
- Zod schemas can be used for both validation and type safety
Frequently Asked Questions
How are JSON types mapped to Zod?
JSON strings → z.string(), numbers → z.number() or z.number().int(), booleans → z.boolean(), null → z.null(), arrays → z.array(), objects → z.object({}). Auto-detection adds .email(), .url(), .datetime() for strings and .int(), .positive() for numbers.
What is Zod?
Zod is a TypeScript-first schema declaration and validation library. It lets you define schemas that can validate data at runtime and infer TypeScript types at compile time. It's widely used for API validation, form validation, and configuration validation.
How do I use the generated schema?
Import the schema in your TypeScript file, then use schema.parse(data) to validate and parse data, or schema.safeParse(data) to get a result object without throwing. The inferred type is exported as SchemaNameType.
Can I add custom validation rules?
Yes! Click "Show Validation Options" to configure string length limits, number ranges, array sizes, and toggle auto-detection for emails, URLs, datetimes, integers, and positive numbers.
Is my data sent to a server?
No, all processing happens entirely in your browser. Your JSON data never leaves your device.