JSON to Python
Convert JSON to Python dataclasses with typing annotations. Optional and nullable fields are typed correctly. Runs entirely in your browser.
Paste JSON and click Generate to produce Python dataclasses.
JSON input
Generated Python
What this tool does
This JSON to Python converter takes a JSON document and generates Python type definitions from its shape. It runs entirely in your browser — your data never leaves the page.
How it works
1. Infer types. Every value is inspected: strings, numbers, booleans, null, arrays and nested objects.
2. Merge shapes. Array items are merged so optional fields stay optional.
3. Name fields. Keys become valid target-language identifiers.
4. Emit code. Python definitions preserve original JSON keys.
Frequently asked questions
What Python types are generated?
Dataclasses with typing annotations. List, Optional, and Any are imported automatically when needed.
Are optional fields handled?
Yes. Optional fields are given a default of None.
Does JSON to Python upload my data?
No. JSON to Python runs entirely in your browser — your input never leaves this page.
Is JSON to Python free to use?
Yes. JSON to Python is completely free, with no account and nothing to sign up for.