Check configuration file type is JSON
    Return a boolean indicating wheather the file is JSON format or not

def is_json_file(filename, show_warnings = False):
    """Check configuration file type is JSON
    Return a boolean indicating wheather the file is JSON format or not
    """
    try:
        config_dict = load_config(filename, file_type = "json")
        is_json = True
    except:
        is_json = False
    return(is_json)