Logging with winston-mongodb and express-winston

问题

I'm trying to log request/response into MongoDB within NodeJS project using express-winston and winston-mongodb. Here is an example code that I worked so far;

const expressWinston = require('express-winston');
const winston = require('winston'); 
require('winston-mongodb').MongoDB;

const logger = expressWinston.logger({
 transports: [
    winston.add(winston.transports.MongoDB, {
        db : 'something',
        collection : 'something',
        level : 'info',
        capped : true
    })
 ]
});

I'm exporting this logger and using it my index.js;

app.use(logger);

And at the end, I'm facing 2 problems;

1. A new entry is created in my Mongo collection for each request/response but they are empty as shown below

2. I got an exception even the entry is created;

   TypeError: cb is not a function at logDb.collection.insertOne.then.catch.err (\node_modules\winston-mongodb\lib\winston-mongodb.js:213:7)

Here is the code block from winston-mongodb.js that causes the exception;

this.logDb.collection(this.collection).insertOne(entry).then(()=>{
  console.error('55dddddrrr', {});
  this.emit('logged');
  **cb(null, true);**
})

I've been trying to solve this but couldn't came up with anything useful yet. Would appreciate any help on the issue.

回答1:

I have the same issue, seems that the winston-mongodb log function takes different argument ( info as the meta object to be logged into the mongo database, cb is the callback function if you want to see the result after the log operation on the mongo done)

Solution : install the winston-mongodb package with the version no 3.0.0

npm install winston-mongodb@3.0.0 --save

reference to the github issue cb is not a function

来源：https://stackoverflow.com/questions/48202738/logging-with-winston-mongodb-and-express-winston