JSON to JSON Schema

Instantly convert JSON to JSON Schema draft-07. Infers types, required fields, and nested structures automatically. Free, browser-based, no sign-up.

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JSON Input
JSON Schema (draft-07)

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How to Use

  1. Paste your JSON into the JSON Input pane on the left.
  2. The JSON Schema pane on the right updates automatically.
  3. Click Copy to copy the schema to your clipboard.
  4. Refine the schema as needed — add constraints, descriptions, or adjust required fields.

Understanding the Output

The generated schema always includes $schema pointing to draft-07. Object properties are inferred from the JSON keys. The required array lists every non-null key found. Array items use an inferred schema based on the elements present.

Next Steps After Generation

A generated schema is a starting point. Common refinements include: adding description fields for documentation, tightening string constraints with minLength or pattern, marking optional properties by removing them from required, and adding enum for fields with a known set of values.

FAQ

What is JSON Schema?

JSON Schema is a vocabulary that describes the structure, constraints, and documentation of JSON data. It defines expected types, required fields, format rules, and nested object shapes, and is widely used for API validation, code generation, and documentation.

Which JSON Schema version does this tool generate?

This tool generates JSON Schema draft-07, one of the most widely supported versions, compatible with validators like AJV, jsonschema (Python), and the JSON Schema Validator tool on ZeroTool.

How are required fields determined?

Every non-null property found in the input JSON object is added to the required array. Null values are excluded because their presence cannot be guaranteed. You can edit the output schema to adjust the required list for your use case.

Does it handle nested objects and arrays?

Yes. The tool recursively processes nested objects and arrays. Arrays infer an items schema based on the types of elements found. Nested objects produce nested properties and required arrays.

Can I use the generated schema for validation?

Yes. Paste the generated schema into the JSON Schema Validator tool on ZeroTool or any AJV-based validator. You may need to refine optional fields or add additional constraints like minLength, minimum, or pattern.