Creating a file logging system with log4js to capture Console logs

Is there a way to automatically log all console logs, including failed expectations and exceptions, to a file without using try and catch in JavaScript? In Java's LOG4j, the rootlogger feature does this by default. Is there a similar functionality available in log4JS for JavaScript?

log4js.configure({
  appenders: [
    {
      type: "clustered",
      appenders: [
        {
          type: "dateFile",
          filename: "log/access.log",
          pattern: "-yyyy-MM-dd",
          category: "http"
        },
        {
          type: "file",
          filename: "log/app.log",
          maxLogSize: 10485760,
          numBackups: 3
        },
        {
          type: "logLevelFilter",
          level: "ERROR",
          appender: {
            type: "file",
            filename: "log/errors.log"
          }
        }
      ]
    }
  ]
})

Answer №1

To customize the default console.log functionality and redirect it to your own logger, you can do the following:

const logger = log4js.getLogger('cheese');
console.log = (msg) => logger.trace(msg);

A similar approach can be taken for other functions like console.debug, etc.

However, it is recommended to explicitly call the logger instead for better control and clarity.

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