diff --git a/toardb/stationmeta/crud.py b/toardb/stationmeta/crud.py
index 24a21c4475eeb8c34ade8e13f2d1d3aa5edd52b3..8b296bd2de42e3df67869b872b5ea47763842c6d 100644
--- a/toardb/stationmeta/crud.py
+++ b/toardb/stationmeta/crud.py
@@ -11,7 +11,6 @@ from sqlalchemy.orm import Session
 from sqlalchemy.dialects.postgresql import JSONB, ARRAY
 from fastapi import File, UploadFile
 from fastapi.responses import JSONResponse
-from fastapi.encoders import jsonable_encoder
 from . import models
 from .models import stationmeta_core_stationmeta_roles_table, stationmeta_core_stationmeta_annotations_table, \
                     CZ_enum, CV_enum, ST_enum, TA_enum
@@ -26,7 +25,7 @@ def get_stationmeta_core(db: Session, station_code: str):
     # there is a mismatch with coordinates and additional_metadata
     if db_object:
         db_object.coordinates = get_coordinates_from_geom(db_object.coordinates)
-        db_object.additional_metadata = str(db_object.additional_metadata)
+        db_object.additional_metadata = str(db_object.additional_metadata).replace("'",'"')
     return db_object
 
 
@@ -35,7 +34,7 @@ def get_stationmeta(db: Session, station_code: str):
     # there is a mismatch with coordinates and additional_metadata
     if db_object:
         db_object.coordinates = get_coordinates_from_geom(db_object.coordinates)
-        db_object.additional_metadata = str(db_object.additional_metadata)
+        db_object.additional_metadata = str(db_object.additional_metadata).replace("'",'"')
     return db_object
 
 
@@ -44,7 +43,7 @@ def get_all_stationmeta_core(db: Session, skip : int = 0, limit: int = None):
     for db_object in db_objects:
         # there is a mismatch with coordinates and additional_metadata
         db_object.coordinates = get_coordinates_from_geom(db_object.coordinates)
-        db_object.additional_metadata = str(db_object.additional_metadata)
+        db_object.additional_metadata = str(db_object.additional_metadata).replace("'",'"')
     return db_objects
 
 
@@ -53,7 +52,7 @@ def get_all_stationmeta(db: Session, skip : int = 0, limit: int = None):
     for db_object in db_objects:
         # there is a mismatch with coordinates and additional_metadata
         db_object.coordinates = get_coordinates_from_geom(db_object.coordinates)
-        db_object.additional_metadata = str(db_object.additional_metadata)
+        db_object.additional_metadata = str(db_object.additional_metadata).replace("'",'"')
     return db_objects
 
 
@@ -91,7 +90,7 @@ def create_stationmeta(db: Session, stationmeta: StationmetaCreate):
     # in upload command, we have now: "additional_metadata": "{}"
     # but return from this method gives: "additional_metadata": {}
     # ==> there is a mismatch between model(JSONB) and schema(JSON)
-    db_stationmeta.additional_metadata = str(db_stationmeta.additional_metadata)
+    db_stationmeta.additional_metadata = str(db_stationmeta.additional_metadata).replace("'",'"')
     db_stationmeta.coordinate_validation_status = get_value_from_str(CV_enum,db_stationmeta.coordinate_validation_status)
     db_stationmeta.type_of_environment = get_value_from_str(ST_enum,db_stationmeta.type_of_environment)
     db_stationmeta.type_of_area = get_value_from_str(TA_enum,db_stationmeta.type_of_area)
diff --git a/toardb/stationmeta/schemas.py b/toardb/stationmeta/schemas.py
index 85e9e5465baad57c4aeabc7d0e5c751a2f7d405c..9710a963b2bc0787f016bcedb5897517a03f4ad2 100644
--- a/toardb/stationmeta/schemas.py
+++ b/toardb/stationmeta/schemas.py
@@ -45,7 +45,8 @@ class StationmetaCoreBase(BaseModel):
     coordinate_validator_id: int
 
     class Config(BaseConfig):
-        arbitrary_types_allowed = True
+        orm_mode = True
+#       arbitrary_types_allowed = True
 
     @validator('coordinate_validation_status')
     def check_coordinate_validation_status(cls, v):