Pass POST Data to next Express

I am trying to load a page on whether or not a user's information that was sent via POST has been verified by the database:

app.post('/login', [function(req, res, next){
    if (err) {
      console.error('error connecting: ' + err.stack);
      res.app.locals.error = 1
      res.app.locals.ID = req.body.ID
      return;
     }

  })

I then try to access res.app.locals.ID in the next, but it comes out an undefined. Any ideas?

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