[add]: enforce content type json

app/__init__.py

@@ -2,7 +2,7 @@ from flask import Flask
 from flask_cors import CORS
 from app.config import Config
 from app.routes import api
-from app.errors import bad_request, method_not_allowed, not_found
+from app.errors import method_not_allowed, unsupported_media_type
 
 def create_app():
     """ Factory function to create a Flask app instance """
@@ -19,8 +19,7 @@ def create_app():
 
    
     # Error Handlers
-    app.register_error_handler(400, bad_request)
-    app.register_error_handler(404, not_found)
     app.register_error_handler(405, method_not_allowed)
+    app.register_error_handler(415, unsupported_media_type)
 
     return app