Log4js
Log4js is a logging framework for Node.js applications that provides flexible and configurable logging capabilities. It allows developers to log messages at different severity levels (e.g., debug, info, error) and output them to various destinations like files, consoles, or external services. The library supports features such as log rotation, custom appenders, and pattern layouts to help manage application logs effectively.
Developers should use Log4js when building Node.js applications that require structured and scalable logging for debugging, monitoring, and auditing purposes. It is particularly useful in production environments where logging needs to be configurable without code changes, such as in web servers, APIs, or microservices, to track errors, performance metrics, and user activities.