Enhance JSONEncoder supporting dataclasses

flask_json_dataclass.py

from flask import Flask
from flask.json import JSONEncoder


class EnhancedJSONEncoder(JSONEncoder):
    def default(self, o):
        if dataclasses.is_dataclass(o):
            return dataclasses.asdict(o)
        return super().default(o)

app = Flask(__name__)
app.json_encoder = EnhancedJSONEncoder