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Node.js logging is an essential part of creating, debugging, and maintaining your application. By analyzing logs you can understand what’s happening in the code to quickly identify and resolve problems and find opportunities for improvements. Logging libraries help you to apply best practices and provide features you shouldn’t spend time implementing yourself. What makes a good log message? When should you log? When, when and when to log, what is the right level for your log messages? When and when you log, the message should be **unique** and **descriptive**