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JSON Toolbox- Free online JSON tools

JSON to Python

Convert JSON to Python dataclasses with type hints online. Types are inferred for nested objects and arrays — and everything runs in your browser.

  • 100% client-side, nothing uploaded
  • Instant results
  • Works offline once loaded
Input JSON

Empty

Python output

Empty

How it works

About this tool

This free online JSON to Python generator turns a sample JSON payload into Python dataclasses with type hints. Paste a representative response, set a root type name, and the tool infers a type for every field — including nested objects and array elements.

The generator emits @dataclass definitions with typing hints such as List, Optional, and Any. Optional and nullable fields default to None, and `from __future__ import annotations` lets classes reference each other in any order.

Handy when you need typed models for API clients, ETL scripts, or FastAPI / Pydantic-adjacent workflows and want a quick dataclass skeleton from a real payload.

Generation runs entirely in your browser. Your JSON is never uploaded or stored, so it is safe to use with production API responses and payloads that contain sensitive data.

JSON Toolbox processes all data locally in the browser. Nothing is uploaded to a server.

Common questions

Frequently asked questions

How do I convert JSON to Python?
Paste your JSON into the input editor and the generated Python code appears on the right. Set a root type name to control what the top-level type is called, then copy or download the result.
Does it handle nested objects and arrays?
Yes. Nested objects become their own named types, and arrays are typed by their element. When objects in an array have slightly different shapes, their fields are merged and any field missing from some items is marked optional.
What should I know about the generated Python code?
Generated dataclasses reflect the sample’s shape; they do not emit validators or custom serializers. Heterogeneous arrays and free-form dictionaries may use broader types such as Any — tighten those fields before shipping production code.
Is my JSON uploaded anywhere?
No. The Python code is generated locally in your browser. Nothing is sent to a server, logged, or stored — even for large or sensitive payloads.

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