for fieldName, errorMessages in form.errors.items(): for err in errorMessages: # do something with your errorMessages for fieldName

from flask import Flask, abort
from auth import AuthError
# depending on the error either 400 or any
#just work with the following
@app.errorhandler(404)
def resource_not_found(error): return jsonify({ "success": True, "error": 404, "message": "Resource not found" }), 404
##This works for any type of status code error
#You'll follow the same steps just change the error value and message :)
### also for Auth error.
@app.errorhandler(AuthError)
def AuthError(error): """Need to return JSON and we'll have to get a response""" response = jsonify(error) response.status_code = error.status_code return response

from flask import json
from werkzeug.exceptions import HTTPException
@app.errorhandler(HTTPException)
def handle_exception(e): """Return JSON instead of HTML for HTTP errors.""" # start with the correct headers and status code from the error response = e.get_response() # replace the body with JSON response.data = json.dumps({ "code": e.code, "name": e.name, "description": e.description, }) response.content_type = "application/json" return response

from werkzeug.exceptions import HTTPException
@app.errorhandler(Exception)
def handle_exception(e): # pass through HTTP errors if isinstance(e, HTTPException): return e # now you're handling non-HTTP exceptions only return render_template("500_generic.html", e=e), 500

from waitress import serve
# app.run(host='0.0.0.0', port=port) # <---- REMOVE THIS
# serve your flask app with waitress, instead of running it directly.
serve(app, host='0.0.0.0', port=port) # <---- ADD THIS