now errors are sent with json form instead of html

src/server.py

@@ -5,7 +5,7 @@ from flask_socketio import SocketIO
 from routes.index import router as index_router
 from routes.answers import router as answers_router
 from routes.datasets import router as datasets_router
-
+from werkzeug.exceptions import HTTPException
 import os
 
 app = Flask(__name__, static_folder='../public', static_url_path='/')
@@ -17,6 +17,22 @@ app.register_blueprint(answers_router)      # mounts at '/answers'
 app.register_blueprint(datasets_router)     # mounts at '/datasets'
 
 
+@app.errorhandler(Exception)
+def handle_exception(e):
+    if isinstance(e, HTTPException):
+        response = {
+            "error": e.name.lower().replace(" ", "_"),  # e.g. "not_found"
+            "message": e.description,
+        }
+        return app.json.response(response), e.code or 500
+
+    app.logger.exception(e)
+    return (
+        app.json.response({"error": "internal_server_error", "message": str(e)}),
+        500,
+    )
+
+
 def init_socketio(app):
     socketio = SocketIO(app, cors_allowed_origins='*')