JSON → JSON Schema Generator
Infer JSON Schema from sample JSON in your browser—ideal for documenting APIs and validating payloads. Draft 07 / 2020-12 meta-schema, optional merge for arrays of objects, fully local processing.
JSON → JSON Schema Generator
Infer JSON Schema from sample JSON in your browser—ideal for documenting APIs and validating payloads. Draft 07 / 2020-12 meta-schema, optional merge for arrays of objects, fully local processing.
Inference runs entirely in your browser. Your JSON never leaves your device.
This tool derives structure from examples only. Optional fields appear when keys are missing in some rows (when merging arrays of objects). It cannot know business rules or regex patterns—you should review and tighten the schema before production.
Frequently Asked Questions
How accurate is inferred JSON Schema?
This tool derives structure from examples only. Optional fields appear when keys are missing in some rows (when merging arrays of objects). It cannot know business rules or regex patterns—you should review and tighten the schema before production.
Which draft should I use?
Draft 07 is widely supported. Draft 2020-12 is the latest series; choose it if your toolchain expects newer keywords. Both outputs include the matching $schema URI.
Is my JSON uploaded?
No. Parsing and inference run locally in your browser using JavaScript only.
Why does my array of objects look merged?
With ‘Merge arrays of objects’ enabled, each object row is combined so shared keys stay required only when present in every row—matching common API sample lists.