Are all example keys required?

When required fields are on, every key in each example object becomes required. Turn that option off if omitted keys are valid.

What does strict properties mean?

It adds additionalProperties: false to each inferred object. That rejects fields absent from the example.

Does validation cover the entire JSON Schema standard?

No. The included checker covers the constraints this generator emits. Use a full validator for other keywords or production contracts.

JSON Schema generator

Infer and edit a JSON Schema from an example object.

Example contact: A contact with name, email, active status, and a list of tags.

Example JSON

Change the example to update the schema.

Schema draftRequire example keysInfer email, date-time, and URI formatsReject other object properties

Validate another JSON value

Checked against the generated keywords shown here.

Example value matches the generated schema.

Generated schema

Schema ready from the example.

A single example cannot show optional fields, alternate types, or every array item shape. Review the output before using it as a contract.

Embed this tool

Copy this snippet to show the tool on your site.

How it works

Each example value determines a type; object keys become properties and the first array element supplies the item shape.

Optional controls add required keys, strict object properties, and recognized string formats.

Sources and checked dates

JSON Schema draft 2020-12Checked 28 September 2026
JSON Schema draft-07Checked 28 September 2026
JSON Schema object propertiesChecked 28 September 2026
JSON Schema string formatsChecked 28 September 2026

Limits

One example cannot reveal every valid shape. Review required fields and arrays before using the schema.
The browser validator checks generated types, required fields, additional properties, and selected formats. It is not a full JSON Schema validator.

Common questions

Are all example keys required?: When required fields are on, every key in each example object becomes required. Turn that option off if omitted keys are valid.
What does strict properties mean?: It adds additionalProperties: false to each inferred object. That rejects fields absent from the example.
Does validation cover the entire JSON Schema standard?: No. The included checker covers the constraints this generator emits. Use a full validator for other keywords or production contracts.

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