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JSON Schema Generator

Generate JSON Schema from JSON data with auto type detection and validation

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About This Tool

The JSON Schema Generator creates JSON Schema definitions from your JSON data. It analyzes the structure and types, producing a complete schema following JSON Schema draft-07 and draft-2020-12 specifications with automatic type inference and required field detection.

Key Features

Quick Preview

Use Cases

json schema validation api draft-07

Frequently Asked Questions

Which JSON Schema versions are supported?

The tool supports JSON Schema Draft-07 and Draft-2020-12. You can select the target version from the dropdown menu before generating, and the schema will automatically include the appropriate $schema declaration.

How does type inference work?

The tool automatically infers types from JSON values: strings become string, integers become integer, floats become number, booleans become boolean, arrays become array, objects become object, and null becomes null. Nested structures generate sub-schemas recursively.

What formats can be inferred?

When the Infer Formats option is enabled, the tool recognizes common string formats including email, URI, date-time, and UUID, adding the corresponding format field to the schema. Unmatched strings are simply typed as string.

Is my data safe when using this tool?

Absolutely. All JSON parsing and schema generation happen locally in your browser. No data is uploaded to any server, keeping your data structures completely private.

How can I verify the generated schema is correct?

After generating a schema, click the Validate button to check the original JSON data against the generated schema. The tool reports validation results including type mismatches, missing required fields, and other errors.