log4js-node

A port of log4js to node.js

View the Project on GitHub

Frequently Asked Questions

I want errors to go to a special file, but still want everything written to another file - how do I do that?

You’ll need to use the logLevelFilter. Here’s an example configuration:

log4js.configure({
  appenders: {
    everything: { type: 'file', filename: 'all-the-logs.log' },
    emergencies: {  type: 'file', filename: 'oh-no-not-again.log' },
    'just-errors': { type: 'logLevelFilter', appender: 'emergencies', minLevel: 'error' }
  },
  categories: {
    default: { appenders: ['just-errors', 'everything'], level: 'debug' }
  }
});

const logger = log4js.getLogger();
logger.debug('This goes to all-the-logs.log');
logger.info('As does this.');
logger.error('This goes to all-the-logs.log and oh-no-not-again.log');

I want to reload the configuration when I change my config file - how do I do that?

Previous versions of log4js used to watch for changes in the configuration file and reload when it changed. It didn’t always work well, sometimes leaving file handles or sockets open. This feature was removed in version 2.x. As a replacement, I’d suggest using a library like watchr to notify you of file changes. Then you can call log4js.shutdown followed by log4js.configure again.