JSON Schema Generator
Turn any JSON data into a Draft-07 JSON Schema instantly
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
Paste in JSON data and this tool infers the type of every value (string, number, object, array, and more) to build a Draft-07 JSON Schema in real time. It's handy for developers documenting an API or drafting validation rules, and since everything runs in your browser, your data never leaves your device.
How to use
- Paste or type your source JSON data into the input box on the left.
- Optionally give the schema a title, and check the box if every property should be marked required.
- The generated JSON Schema appears instantly as you type.
- Click the copy button to grab the schema and use it wherever you need it.
FAQ
- What happens if an array mixes different value types?
- When array items have more than one type, the tool picks a sample of each type and combines them into an anyOf schema.
- What does the 'Make all properties required' option do?
- When checked, every key of an object is added to its required array, so the resulting schema treats those properties as mandatory.
- What if I paste invalid JSON?
- The tool shows an error message describing the JSON syntax problem instead of generating a schema.