How to use express-winston and winston-mongodb together?

Question

I'm using express-winston and winston-mongodb to log express requests to mongodb.

express-winston config:

expressWinston.logger({
  meta: true,
  //...other unrelated config
})

winston-mongodb config:

new MongoDB({
  //...other unrelated config
})

Logging to mongodb works, but meta field is null. Logging to file/console works perfectly.

The mongo plugin doesn't recognize the express plugin's log format.

How can I get them to play nice?

Answer 1

When you look at the express-winston and winston-mongodb codes, you can easily see the difference. winston-mongodb writes the value that matches the metaKey field to the specified collection. Therefore, if you define it as follows, the meta field will not be null.

...
transports: [
    new winston.transports.Console({
        format: winston.format.json({
            space: 2
        })
    }),
    new winston.transports.MongoDB({
        db: config.db.mongooseURI,
        options: config.db.options,
        collection:'logs',
        capped:true,
        metaKey:'meta'
    }),


],
meta: true,
...