All Tools VerseJSON Schema Generator
Turn any JSON sample into a JSON Schema, with draft-07 or 2020-12, format detection, and required field options.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
JSON sample
Result
JSON Schema
Built locally in your browser. Nothing is uploaded.
How to Use JSON Schema Generator
- Paste a JSON sample. Drop in a JSON object or array. The tool reads its shape to build a matching schema.
- Choose the draft. Pick draft-07 or 2020-12 depending on what your validator expects.
- Set the options. Decide whether every property is required, whether extra properties are allowed, and whether to detect formats.
- Review the schema. Check the stats for property count and nesting, and read the generated schema.
- Copy the schema. Use the copy button and drop the schema into your project or validator.
Frequently Asked Questions
What is a JSON Schema?
It is a standard way to describe the shape of JSON data so it can be validated. It is different from Schema.org markup used for SEO.
Which drafts are supported?
You can generate against draft-07 or draft 2020-12. The only difference here is the schema URL at the top of the output.
How are formats detected?
When format detection is on, the tool recognises common string formats such as email, uri, date, and date-time and adds a format keyword.
What does required do?
With require all on, every property in the sample is listed as required. Turn it off to make all properties optional.
How are arrays of objects handled?
The tool looks across the objects in an array, unions their properties, and marks the ones present in every item as required.
Is my data sent anywhere?
No. The schema is built in your browser, so the JSON you paste is never uploaded.
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