diff --git a/routes/utils/credentials.py b/routes/utils/credentials.py
new file mode 100644
index 0000000..5df2c90
--- /dev/null
+++ b/routes/utils/credentials.py
@@ -0,0 +1,116 @@
+import json
+from pathlib import Path
+import shutil
+
+def create_credential(service, name, data):
+    """
+    Creates a new credential file for the specified service.
+    
+    Args:
+        service (str): 'spotify' or 'deezer'
+        name (str): Custom name for the credential
+        data (dict): Dictionary containing the credential data
+        
+    Raises:
+        ValueError: If service is invalid or data is missing required fields
+        FileExistsError: If the credential directory already exists
+    """
+    if service not in ['spotify', 'deezer']:
+        raise ValueError("Service must be 'spotify' or 'deezer'")
+    
+    # Validate data structure
+    required_fields = []
+    if service == 'spotify':
+        required_fields = ['username', 'credentials']
+        data['type'] = 'AUTHENTICATION_STORED_SPOTIFY_CREDENTIALS'
+    else:
+        required_fields = ['arl', 'email', 'password']
+    
+    for field in required_fields:
+        if field not in data:
+            raise ValueError(f"Missing required field for {service}: {field}")
+    
+    # Create directory
+    creds_dir = Path('./creds') / service / name
+    try:
+        creds_dir.mkdir(parents=True, exist_ok=False)
+    except FileExistsError:
+        raise FileExistsError(f"Credential '{name}' already exists for {service}")
+    
+    # Write credentials file
+    file_path = creds_dir / 'credentials.json'
+    with open(file_path, 'w') as f:
+        json.dump(data, f, indent=4)
+
+def delete_credential(service, name):
+    """
+    Deletes an existing credential directory.
+    
+    Args:
+        service (str): 'spotify' or 'deezer'
+        name (str): Name of the credential to delete
+        
+    Raises:
+        FileNotFoundError: If the credential directory does not exist
+    """
+    creds_dir = Path('./creds') / service / name
+    if not creds_dir.exists():
+        raise FileNotFoundError(f"Credential '{name}' not found for {service}")
+    
+    shutil.rmtree(creds_dir)
+
+def edit_credential(service, name, new_data):
+    """
+    Edits an existing credential file.
+    
+    Args:
+        service (str): 'spotify' or 'deezer'
+        name (str): Name of the credential to edit
+        new_data (dict): Dictionary containing fields to update
+        
+    Raises:
+        FileNotFoundError: If the credential does not exist
+        ValueError: If new_data contains invalid fields or missing required fields after update
+    """
+    # Validate service
+    if service not in ['spotify', 'deezer']:
+        raise ValueError("Service must be 'spotify' or 'deezer'")
+    
+    # Load existing data
+    creds_dir = Path('./creds') / service / name
+    file_path = creds_dir / 'credentials.json'
+    if not file_path.exists():
+        raise FileNotFoundError(f"Credential '{name}' not found for {service}")
+    
+    with open(file_path, 'r') as f:
+        data = json.load(f)
+    
+    # Validate new_data fields
+    allowed_fields = []
+    if service == 'spotify':
+        allowed_fields = ['username', 'credentials']
+    else:
+        allowed_fields = ['arl', 'email', 'password']
+    
+    for key in new_data.keys():
+        if key not in allowed_fields:
+            raise ValueError(f"Invalid field '{key}' for {service} credentials")
+    
+    # Update data
+    data.update(new_data)
+    
+    # Ensure required fields are present
+    required_fields = []
+    if service == 'spotify':
+        required_fields = ['username', 'credentials', 'type']
+        data['type'] = 'AUTHENTICATION_STORED_SPOTIFY_CREDENTIALS'  # Ensure type is correct
+    else:
+        required_fields = ['arl', 'email', 'password']
+    
+    for field in required_fields:
+        if field not in data:
+            raise ValueError(f"Missing required field '{field}' after update for {service}")
+    
+    # Save updated data
+    with open(file_path, 'w') as f:
+        json.dump(data, f, indent=4)
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