JSON Schema Generator — Infer a Schema from JSON
Generate a JSON Schema Draft 7 document from a sample object or array. Inspect inferred types and choose whether fields present in every sample should be required.
Processed in your browser. Inferred from your sample, not a complete contract. Review types and required fields before using the schema.
Make the most of this tool
Array items are inspected together. A field missing from one object is not marked required. Mixed types become anyOf alternatives.
Empty arrays have an unrestricted items schema because a sample cannot reveal their element type.
Generated schemas allow additional properties. Edit this rule and business constraints before using a schema as a contract.
Frequently Asked Questions
Which JSON Schema draft does this generate?
The output uses Draft 7. Types are inferred from your sample, including values from every item in an array.
How are required fields chosen?
With the required-fields option enabled, a field is required only if it appears in every sampled object at that level. Turn the option off to generate optional fields.
Is an inferred schema ready for production?
Review it first. A sample cannot reveal every allowed value or business rule. Copy the schema into the schema validator to edit types and constraints and test more examples.