DEBUG=express:* does not work in [email protected]

[cp3hnu]

Description

Debugging Express said
"To see all the internal logs used in Express, set the DEBUG environment variable to express:* when launching your app."
DEBUG=express:* node index.js

But it does not work in [email protected]
There is also no answer on Moving to Express 5

Expectations

How to debug in [email protected]?

[jonchurch]

express:application scope debugging is coming through fine.

But notably express:router is not coming through. In v5 router was moved out into another package, seems to have dropped the debug lib. I dont know that the exclusion was on purpose, cc @wesleytodd

An aside, splitting like this makes it more difficult to debug router under the express:* namespace. Not impossible, but something to solve for.

[UlisesGascon]

I dont know that the exclusion was on purpose

+1 AFAIK this was not an intended move. I will consider this as a bug and one of the reason to not tag express@5 as latest in npm

[bjohansebas]

This doesn't seem to be a bug, it was done in this commit(pillarjs/router@0b5a0a6) and is listed in the changelog for releasing version 2 of the router (pillarjs/router#60).

Although +1 on bringing it back, it's useful for debugging while we have a new logger.

[azadsingh99]

Directly using DEBUG=express:* node index.js because express no longer directly using the debug package
however we can add internal logs into the middleware for tracking

app.use((req, res, next) => {
  console.log(`[DEBUG] ${req.method} ${req.url}`);
  next();
});

[wesleytodd]

I swear I had written a reply to this, sorry I must have accidentally forgotten to hit send, sorry. Maybe was it on the router repo or slack or something? Either way, I from what @bjohansebas showed it was done on purpose, I just wish we knew more than what the router repo shows.

In the long run I would very much like to remove this dependency and use a proper logger (pino) by default. This has a bunch of benefits, but mainly unifying the app logging and framework logging lets authors have consistent formatting and log handling.

So, for today since the change landed nearly 4 years ago and folks are just now noticing, lets not make a hasty decision? We can for sure add this to the "fix before latest" release, but I think we should see if we could easily land a logger integration, since that would be long term better anyway.

[krzysdz]

There was a discussion about removing debug in router in 2017: pillarjs/router#57