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JSON to JSON Schema Generator — Infer Types & Structure Instantly

Paste a JSON example and get a valid JSON Schema generated instantly — types, nested object structure, and array item schemas inferred directly from your data — saving the manual work of writing a schema by hand from scratch.

How to use JSON Schema Gen

1. Paste your example JSON.
2. Review the inferred schema.
3. Adjust required fields and constraints as needed.
4. Copy the generated JSON Schema.

Frequently asked questions

Does the inferred schema mark every field as required?

By default fields present in your example are marked required, since inference has no way to know which are optional from a single example — adjust manually if some fields are actually optional.

Which JSON Schema draft does it target?

It generates schema compatible with commonly used modern drafts (2019-09/2020-12 style), which work with most current validators.

Can it infer from an array of examples?

Providing multiple example objects (or an array) generally produces a more accurate schema than inferring from a single example, since it can detect fields that are actually optional.

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