JSON Schema Generator

About JSON Schema Generator

The JSON Schema Generator infers a JSON Schema from sample JSON data. JSON Schema is the standard way to describe the structure, types, and validation rules of JSON documents. It is widely used for API documentation (OpenAPI/Swagger), form validation, data validation pipelines, and configuration file validation.

Key Features

• Type inference — correctly identifies strings, numbers, integers, booleans, arrays, objects, and null types.
• Nested schema generation — recursively generates schemas for deeply nested objects.
• Array item schemas — infers the schema for array items by merging all elements.
• Required fields — optionally mark all properties as required.
• Examples — optionally include example values from the source data.
• Multiple drafts — supports JSON Schema Draft 2020-12, Draft-07, and Draft-04.

How to Use

1. Input JSON — paste sample JSON into the editor, upload a file, or fetch from a URL.
2. Configure — select the schema draft version and toggle options.
3. Generate — click Generate Schema or press Ctrl+Enter.
4. Export — copy or download the generated schema as a .json file.