NodeJS Logger: winston.transports.DailyRotateFile is not a function

问题

I'm writing a rest api with NodeJS and express and I'm using express-winston to log accesses and erros. But I want to separate de log daily. Like in this post

I'm trying to do so with winston.transports.DailyRotateFile. A piece of code below.

api.use(expressWinston.logger({
    transports: [
      new winston.transports.DailyRotateFile({
          name: 'file',
          datePattern: '.yyyy-MM-ddTHH',
          filename: path.join(__dirname, "log-access", "log_file.log")
      })
    ]
}));

Then I receive the error: winston.transports.DailyRotateFile is not a function

I guess I have to install another pack, since reading winston's doc I found that you can write custom transports.

Would you have information on which package I would have to install? I found some that doesn't match or was discontinued.

Thanks for any help

回答1:

You do not need to assign:

var winston = require('winston'), expressWinston = require('express-winston');
winston.transports.DailyRotateFile = require('winston-daily-rotate-file');

You just need to require it:

const winston = require('winston');
require('winston-daily-rotate-file');

回答2:

I had to do this so it would work:

var winston = require('winston'), expressWinston = require('express-winston');
winston.transports.DailyRotateFile = require('winston-daily-rotate-file');

I already had the right package but it wouldn't work, until I wrote the lines above.

回答3:

What you're looking for is this module.

Just follow the documentation, and you're good to go.

来源：https://stackoverflow.com/questions/35158768/nodejs-logger-winston-transports-dailyrotatefile-is-not-a-function

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node.js

logging

winston