JSON Decoder in Python

This repository contains a custom JSON decoder implemented in Python. TheJSONDecoder class parses JSON strings into native Python data structures without relying on the built-in json module (except for comparison for correctness in tests). The implementation handles all types that can be part of a valid JSON format: strings, numbers, objects, arrays, booleans, and nulls. If decoding fails due to a invalid raw JSON, JSONDecodeError is thrown. The main.py file gives a basic example by comparing the output of this decoder against Python's built-in json.loads.

Usage

You can use the decoder in two ways. Either using the decode(json_str: str) function:

from json_decoder import decode
result = decode('{"key": "value"}')

Or by initializing the JSONDecoder class and calling its decode() method:

from json_decoder import JSONDecoder
decoder = JSONDecoder('{"key": "value"}')
result = decoder.decode()

The tests/ directory includes some tests for correctness, including checks for edge cases. If you make modifications to the code, you can run pytest to verify that your implementaton still passes my test cases. Feel free to make additions to the tests if you come up with other edge cases.