javascript - How to log the Console logs into the file using log4js - Stack Overflow

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I want to log the console logs whether the expect failing or any exception ing into the log file. How can i do that without using try and catch. In LOG4j for java there is rootlogger which automatically logs all the system information logs into the file. Can same be done for 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"
          }
        }
      ]
    }
  ]
})

I want to log the console logs whether the expect failing or any exception ing into the log file. How can i do that without using try and catch. In LOG4j for java there is rootlogger which automatically logs all the system information logs into the file. Can same be done for 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"
          }
        }
      ]
    }
  ]
})

• javascript
• typescript
• protractor
• log4js-node

Share Improve this question Follow edited Jun 20, 2017 at 8:19 user8088868 asked Jun 20, 2017 at 6:03 anuvrat singhanuvrat singh 42111 gold badge88 silver badges2020 bronze badges

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1 Answer 1

Sorted by: Reset to default 5

You can override the default console.log functions to point to your logger e.g.

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

You can do similar things for other functions e.g. console.debug etc.

That said. You would be better off calling logger explicitly.

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