JSON Schema Generator

Generate JSON Schema from any JSON data instantly. Supports Draft 04, 06, 07, 2019-09, and 2020-12. Auto-detect types, formats, and required fields. Free, no signup, 100% client-side.

About JSON Schema Generator

Our free JSON Schema Generator instantly creates JSON Schema definitions from any JSON data. It supports all major JSON Schema draft versions including Draft 04, 06, 07, 2019-09, and 2020-12. The tool automatically infers data types, detects common formats like email, URI, date-time, and UUID, and generates required field constraints. Perfect for API development, data validation, and documentation. All processing happens in your browser - your data never leaves your device.

How to Use

Paste your JSON data or click Load Demo to try with sample data
Select the JSON Schema draft version you need
Toggle Include Required to add required field constraints
Copy the generated schema or download as a file
Use the schema for API validation, documentation, or code generation

Frequently Asked Questions

What JSON Schema draft version should I use?

Draft 07 is the most widely supported and recommended for most use cases. Draft 2020-12 is the latest version with new features like $dynamicRef. Use Draft 04 only for legacy systems that require it.

How does the tool detect data formats?

The generator automatically detects common formats including email addresses, URLs, date-time strings (ISO 8601), dates, and UUIDs. These are added as format hints in the schema to provide additional validation.

What does Include Required do?

When enabled, all non-null properties in your JSON will be marked as required in the generated schema. This is useful for strict API validation where all fields must be present.

Is my JSON data secure?

Yes, all processing happens entirely in your browser. Your JSON data is never sent to any server. You can verify this by using the tool offline after the page loads.