Developer Tools
JSON Schema Generator
🔒 Runs in your browser
Paste any JSON and instantly generate a JSON Schema (draft-07). Free, instant, no upload.
How to use this tool
- Paste a sample JSON object into the input editor.
- Click Generate Schema to infer the Draft-7 schema.
- Copy or download the generated schema for use in your project.
All properties are marked as required by default. Add additionalProperties: false to reject extra keys. Generated schema runs entirely in your browser.
Frequently Asked Questions
- Does the tool send my JSON data to a server to generate the schema?
- No. Schema inference runs entirely in your browser. Your JSON payload is never transmitted to brevio or any third party.
- Which JSON Schema draft does the generated schema conform to?
- The tool generates Draft-7 compatible schemas, which are widely supported by validators, IDEs, and OpenAPI tooling.
- Can the generator handle nested objects and arrays?
- Yes. It recursively infers types for nested objects, arrays of primitives, and arrays of objects, reflecting the full structure of your sample.
- Does the generated schema mark all fields as required?
- Fields present in the sample are listed under required by default. You can edit the output schema to make specific fields optional before using it.
How to Generate a JSON Schema from JSON (Free, In-Browser)
What JSON Schema draft-07 is, how to infer it from example JSON, required vs optional fields strategy, and how to use it for validation and OpenAPI.