Scrapy provides powerful debugging and logging features to help developers develop and maintain spiders. Scrapy uses Python's standard logging module, supporting multiple log levels including DEBUG, INFO, WARNING, ERROR, and CRITICAL. Developers can configure log levels and log formats through settings.py. Scrapy also provides the scrapy shell command, which allows testing selectors and extraction logic in an interactive environment, which is very useful for debugging spiders. Scrapy's parse command can be used to test the response of a single URL, making it convenient for developers to verify spider logic. Scrapy also supports viewing statistics, including the number of successful requests, failed requests, and the amount of data processed. For more complex debugging, developers can use Python's debugging tools such as pdb or IDE debugging features. Scrapy's logs can be output to the console, files, or custom log handlers. Proper use of debugging and logging features can greatly improve development efficiency and troubleshooting capabilities.