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JSON to Python Dataclass

Convert JSON to Python dataclass or TypedDict definitions with type hints, nested classes, and Optional types

JSON to Python Dataclass

Python classes
from dataclasses import dataclass
from typing import Any, Optional


@dataclass
class Address:
    street: str
    city: str
    state: str


@dataclass
class Projects:
    name: str
    stars: int
    language: str


@dataclass
class Root:
    id: int
    name: str
    email: str
    score: float
    active: bool
    tags: list[str]
    address: Address
    projects: list[Projects]
    metadata: Optional[Any]
Convert JSON to other languages:
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Updated . Provided as is. Check the output before you rely on it in production.

How to use JSON to Python Dataclass

  1. 1

    Paste your JSON data

    Input a JSON object or array in the left panel. The tool parses the structure and infers Python types: strings become str, integers become int, decimals become float, booleans become bool, and null becomes Optional[Any].

  2. 2

    Choose class style

    Select @dataclass for full class instances with __init__ and __repr__, or TypedDict for lightweight dictionary type hints. Toggle Optional for null handling.

  3. 3

    Review generated Python classes

    The right panel shows Python class definitions with proper type hints and imports. Nested objects become separate classes. Arrays of objects share a common class type.

  4. 4

    Copy and use in your project

    Click Copy to copy the generated Python definitions including imports. Paste them into your Python source file. The classes are ready to use with json.loads() for parsing JSON data.

Questions and answers

What is JSON to Python Dataclass?
Python dataclasses and TypedDicts give JSON-shaped data type hints, so editors and type checkers catch wrong field names and types. This converter infers either style from sample JSON, with snake_case fields, a class per nested object, list types for arrays, and Optional for null values.
Does JSON to Python store my data?
No. All conversion happens entirely in your browser. Your JSON data never leaves your device — nothing is sent to any server.
What is the difference between dataclass and TypedDict?
A dataclass creates a full class with __init__, __repr__, and __eq__. A TypedDict is a dictionary type hint — it only provides type checking without runtime behavior. Use dataclass for data objects, TypedDict for dictionary-shaped data.
Does JSON to Python handle nested objects?
Yes. Nested JSON objects become separate Python classes. Arrays of objects create a shared class type. Null values are typed as Optional when that option is enabled.

Use it as an API

JSON to Python Dataclass is also callable as a free HTTP JSON API at https://aidevhub.io/api/json-to-python/ — GET with query parameters or POST with a JSON body, no authentication, CORS enabled, fair use (abusive traffic is throttled at the edge; there is no per-request quota header). Responses return { ok, tool, result, meta }. 

curl -s -X POST https://aidevhub.io/api/json-to-python/ \
  -H "Content-Type: application/json" \
  -d '{"json":"{\"id\":1,\"name\":\"Alice\"}","root_name":"User"}'

Machine-readable contract: /api/tool/json-to-python.json All API endpoints: /agents/ LLM site index: /llms.txt

For AI agents: how to call this tool

Machine-readable contract, endpoints and examples. Humans can ignore this section.

Best Path For Builders

Dedicated API endpoint

Deterministic outputs, machine-safe contracts, and production-ready examples.

Dedicated API

https://aidevhub.io/api/json-to-python/

OpenAPI: https://aidevhub.io/api/openapi.yaml

GET /api/json-to-python/ GET json-to-python
POST /api/json-to-python/ POST json-to-python