Free Online JSON Schema Generator

A JSON Schema generator inspects a JSON sample and emits a matching draft-07 schema — types inferred, nested objects recursed, array element types detected.

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How to Use This Developer Tool

  1. Paste a JSON sample into the input area.
  2. Read the generated draft-07 schema in the output panel.
  3. Edit the schema to mark fields optional or add format/pattern constraints.
  4. Click Copy to send the schema to your clipboard.

What Is a JSON Schema Generator?

JSON Schema describes the shape of valid JSON. It's used by OpenAPI specs, Ajv validators, JSON Editor UIs, and many CI lint pipelines. Hand-writing a schema for a real-world API response is tedious; generating one from a sample document and then refining the result is much faster.

The generator walks the input JSON and emits a draft-07 schema with the right `type`, `properties`, `items`, and `required` arrays. Strings, numbers, booleans, null, objects, and arrays are all handled. You'll usually want to add `format` (date-time, email, uri), `pattern`, or `enum` constraints by hand afterwards — those are intent the sample document can't express on its own.

Frequently Asked Questions

What is JSON Schema?
A vocabulary for annotating and validating JSON. Describes structure, types, formats. Used by OpenAPI, AJV, and many validators.
What draft does this output?
Draft-07. It's widely supported (AJV, OpenAPI 3.0, most editors).
Are all keys required?
By default, every key present in the input is added to the `required` array. You can edit the generated schema if some fields are optional.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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