How to use express-winston and winston-mongodb together? - node.js

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,
...

Answer 2

This is what finally worked for me: v6.12.1 Noticed later that while this works for db logging, the meta is empty for the file transport. Not sure why.
const winston = require('winston');
module.exports = function(err, req, res, next) {
winston.error(err.message, {metadata: { prop: err } });
res.status(500).send('Something failed.');
};

Answer 3

If you want to log to File and MongoDB then:
winston.add(
new winston.transports.MongoDB({
db: process.env.CONNECTIONSTRING,
options: { useUnifiedTopology: true },
metaKey: 'meta'
})
)
module.exports = function (err, req, res, next) {
// Log the exception
winston.error({message: err.message, level: err.level, stack: err.stack, meta: err})
res.status(500).send("Something failed..Cannot connect to Server");
};