add appendToJSON() function

functions.py

@@ -30,6 +30,25 @@ def saveJSON(dict, file_path):
         # dump the contents
         json.dump(dict, file, indent=4)
 
+# append to a json file
+def appendToJSON(new_data, file_path):
+    try:
+        # open the file
+        path = Path(file_path)
+        if not path.is_file():
+            with open(path, 'w', encoding="utf-8") as file:
+                json.dump([], file)
+
+        with open(path, 'r+', encoding="utf-8") as file:
+            file_data = json.load(file)
+            file_data.append(new_data)
+            file.seek(0)
+            json.dump(file_data, file, indent=4)
+        return True
+    except Exception as e:
+        app.logger.error(str(e))
+        return False
+
 cfg = loadJSON(const.configFile)
 
 def formatRelativeTime(date_str):