Add option for custom logging format

Using the serializers I can customize what get’s logged. However, I do not have control over the logging format. For example, I would like to log like so:

[1574212772844] INFO (35 on db805887c09f): 11.11.111.111 - GET /url/path - Status Code: 200

Essentially it would mean removing the object with res & err here in logger.js:

      log[level]({
        res: this,
        err: err || this.err || new Error('failed with status code ' + this.statusCode),
        responseTime: responseTime
      }, 'request errored')
      return
    }


    log[level]({
      res: this,
      responseTime: responseTime
    }, 'request completed')

…allowing the user to decide how to format the log.

[waynebloss]

I’d like this option as well.

The suggested 11.11.111.111 - GET /url/path - Status Code: 200 format would be preferred in any configuration instead of the default request completed message, however i’d also add an option to remove details of req and res unless I opt into getting them for specific endpoints.

This code looks easy enough to fork though, so I won’t wait around too long for it.

[rstoermer]

How about using pino-pretty in the following way?

const options = {
    name: "example",
    ...(process.env.NODE_ENV !== "production"
        ? {
              prettyPrint: {
                  ignore: 'req,res,responseTime',
                  messageFormat: (log, messageKey, levelLabel) => {
                      if (log.req) return `${log.responseTime}ms - ${log.msg} - ${log.req.url}`;
                      return `${log.msg}`;
                  }
              }
          }
        : null)
};