AttributeError: module 'flask.json' has no attribute 'JSONEncoder'

[gwalingarj]

Flask 2.2.3
MongoEngine 0.27.0

JSONEncoder = json.JSONEncoder
AttributeError: module 'flask.json' has no attribute 'JSONEncoder'

[CS-PK]

I am facing same issue :(

[iammustafatz]

json_encoder and json_decoder attributes on app and blueprint, and the corresponding json.JSONEncoder and JSONDecoder classes, are removed from Flask version 2.3.0.

So, it shows JSONEncoder = json.JSONEncoder
AttributeError: module 'flask.json' has no attribute 'JSONEncoder'

For more refer: https://flask.palletsprojects.com/en/2.3.x/changes/#version-2-3-0

[idoshr]

This repo is not the address for flask integration issues

Follow this issue in flask-mongoengine:
MongoEngine/flask-mongoengine#522