JSON Schema Generator
Infer a JSON Schema from a sample document, ready to refine.
Your result will appear here as soon as you add some input.
How to use it
- 1Paste your document into the input box, or type it directly.
- 2Adjust the options if you need something other than the defaults.
- 3The result updates as you type.
- 4Copy the result to your clipboard or download it as a file.
About the JSON Schema Generator
The schema is inferred from a single sample, so it is a starting point rather than a finished contract. Array item types come from the first element, every present key is marked required, and optional fields that happen to be absent in the sample are missing entirely.
Integers are distinguished from numbers, which matters: a sample with `1` produces `integer`, and a later `1.5` would then fail validation.
Questions people ask
Is your document uploaded to a server?
No. This tool runs entirely in your browser using standard web APIs, so your document never leaves your device. You can confirm it by opening your browser's network panel while the tool runs, or by disconnecting from the internet after the page has loaded.
Is it free, and do I need an account?
Yes, it is free, and there is no account, no sign-up and no watermark on the result. The project is funded by optional donations.