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Node.js Web Development - Third Edition by David Herron

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Logging

Before we get into databases, we have to address one of the attributes of a high-quality software system—managing logged information, including normal system activity, system errors, and debugging information. Logs are supposed to give us visibility into the behavior of the system. How much traffic is it getting? If it's a website, which pages are people hitting the most? How many errors occur and of what kind? Do attacks occur? Are malformed requests being sent?

Log management is also an issue. Log rotation means moving the log file out of the way every day, or so, to start with a fresh one. You should process logged data to produce reports. A high priority on screening for security vulnerabilities is a must.

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