Add specific field to all logs

[eladmoshe]

It would be really great if it was possible to define some field to be added to all log jsons. This is similar to Bunyan's log.child({key:value}) method which creates a log that appends fields to all log items from that logger.

https://github.com/trentm/node-bunyan#logchild

[villadora]

Hi there is an option field called logger which is provide for flexible customized logger.

If you want to use a logchild, you can do like this:

var log = bunyan.createLogger({
    name: 'myapp',
    serializers: { // add serializers for req, res and err
        req: bunyan.stdSerializers.req,
        req: bunyan.stdSerializers.res,
        err: bunyan.stdSerializers.err
    }
});
var express_loggger = log.child({type: 'express', key: value});

app.use(require('express-bunyan-logger')({
    logger: express_logger
});

But in that way, you might want add serializers by yourself.

[eladmoshe]

Awesome, thanks! Using your code sample, I was able to achieve something very similar to express standard output in bunyan format, only changing the last line to:

app.use(require('express-bunyan-logger')({logger: express_logger, excludes:['user-agent','body','short-body','req-headers','res-headers','req','res','incoming']}));