JSON Schema Generator
Generate a practical starting schema from an example object or array. The tool detects objects, arrays, strings, booleans, integers, numbers, and null values, then marks observed object keys as required.
JSON Schema Generator
Infer a draft 2020-12 schema from representative sample data.
Sample JSON0 lines
Output0 lines
1Ready. Load an example or paste JSON to begin.Ready. Load an example or paste JSON to begin.
Parse summary
- Root
- -
- Keys
- -
- Depth
- -
- Size
- -
Type counts
strings -numbers -booleans -nulls -objects -arrays -
Structure preview
No valid JSON preview.
Data handling notes
- Schema inference runs locally and never uploads the sample.
- The result targets JSON Schema draft 2020-12.
- A generated schema is a starting point; review optional fields, formats, ranges, and mixed arrays manually.
Before you rely on the result
This tool is intended for fast inspection and routine preparation. It can save time, but it does not replace review when the result affects production systems, security settings, business data, or legal obligations.
- Check representative inputs instead of assuming one example covers every edge case.
- Do not paste secrets, private customer data, or credentials unless you have confirmed the page processes that data locally and the use is allowed by your organization.
- Copy the output into your own workflow only after checking formatting, timezone, encoding, or syntax assumptions.
- Data conversion tools preserve structure where possible, but they cannot infer business rules such as optional fields, database dialects, XML namespaces, or CSV column meaning.
FAQ
Can one sample reveal every valid shape?No. Inference only sees the supplied values, so optional fields and alternative types need manual review.
Which schema draft is used?The generated root references JSON Schema draft 2020-12.