JSON Schema Generator
Generate a JSON Schema from your JSON data, live as you type — for validation and documentation.
JSON data
Generated schema
No output yet
Paste JSON on the left — the inferred schema appears here instantly.
About the JSON Schema Generator
A JSON Schema generator infers a schema from a sample JSON document. Instead of writing a schema by hand, you paste representative data and get a starting schema that describes its types and structure — ready to refine.
The generated schema follows the JSON Schema specification and can be used to validate data, document an API contract, or drive code and form generation. Generation runs in your browser, so your sample data stays private.
How to use the JSON Schema Generator
- 1Paste a representative JSON document into the input.
- 2Click Generate Schema to infer types and structure.
- 3Review the schema — add descriptions, formats, and required rules as needed.
- 4Copy the schema into your validation tooling or API docs.
Common uses
Documenting API contracts
Produce a schema that describes exactly what your endpoint returns.
Validating incoming data
Use the schema to reject malformed requests before they reach your logic.
Generating types and forms
Feed the schema into codegen or form-builder tools.
Frequently asked questions
Is the generated schema complete?
It's a strong starting point inferred from your sample. You should refine it — add descriptions, value formats (email, date-time), enums, and adjust which fields are truly required.
Which JSON Schema version does it target?
The output follows the widely supported JSON Schema draft conventions (type, properties, required, items) that work across most validators.
How does it handle arrays?
It infers the item schema from the first element, assuming a homogeneous array. Mixed-type arrays should be reviewed and adjusted manually.
Is my sample data private?
Yes. Schema generation runs locally in your browser.