Any way to include optional values in message?

[ScottChapman]

I have some req that come in with session information, and would like to be able to display that. But the value doesn't always exist.

Specifically, when my users are logged in there is a session token I want to display: req.user.sessionID

But the value doesn't always exist...

How would I express that in the msg?

[rosston]

You could simply add user to the requestWhitelist. When it doesn't exist, nothing will get logged out on the whitelisted req object.

If you specifically want only the sessionID of user and nothing else, you could additionally provide a requestFilter property to the logger options. The body of your requestFilter function would be something like this:

function(req, propName) {
  if (propName === 'user') {
    return {sessionID: req[propName].sessionID};
  }
}

[rosston]

Closing due to inactivity. I think I've answered the question.