JSON Schema Generator from JSON Sample
Infer a starter JSON Schema from pasted JSON without sending data to a server. Use it for API docs, config validation drafts, typed payload reviews, and handoff notes.
Representative payloads
Use a real object that includes fields your schema should describe.
API examples
Start from response samples, config files, webhook events, or test fixtures.
Example
A JSON object with id, name, tags, and owner fields becomes an object schema with nested properties.
Assumption
The sample represents the shape you expect future payloads to follow.
Limitation
The tool cannot infer business rules, optional variants, enums, formats, or all array item possibilities.
Which draft is used?
The generated schema uses the JSON Schema draft 2020-12 $schema URL.
Can it infer optional fields?
It can omit required arrays when that option is off, but it cannot know optional production fields that are missing from the sample.
Can I include examples?
Yes. Turn on examples to include the pasted JSON as a schema example.
Does it need a backend?
No. JSON parsing and schema generation happen locally.
Suggested workflow
JSON schema path
Clean the payload, generate a schema draft, then inspect paths or format the result.