Developer & data · By AIXpress
JSON Schema Generator
Infer a JSON Schema 2020-12 draft from sample JSON, including mixed array values and optional record properties.
Developers drafting validation contracts from representative API examples.
Free to use. Your inputs are processed in this browser and are not included in usage analytics.
How to use json schema generator
- Paste sample JSON with varied records and nullable values.
- Generate a schema with inferred types and required keys common to all sampled objects.
- Review the contract and adjust it for values absent from the sample.
What to know about the result
- Processing stays in this browser. Inputs are never executed and no data is sent to an API.
- Inputs are limited to 200,000 characters, 64 nesting levels, and 50,000 JSON values. Quote integers outside the safe integer range.
- Inference does not guess patterns, date formats, enums, or numeric limits. Empty arrays produce an unconstrained items schema.
- Generated object schemas disallow additional properties; remove that constraint if your API permits extra keys. Reference: https://json-schema.org/understanding-json-schema/reference
Related tools
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- JSON Minifier
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- JSON to CSV Converter
Convert an array of JSON records into CSV with combined headers and spreadsheet-safe cells.
For the next step, explore PDF tools and small business templates.