如何在NodeJS / ExpressJS / Passport中显示登录的用户名？

Question

I want to display the username in case the user is logged in ( function 3 ). Initially, I only had function 1 . I've changed function 1 into function 2 in order to display the username of the logged in user. I am not sure if this is the right way to do this, because I don't know if I need parameters res and next , and function next() . Any idea?

I am using NodeJS , ExpressJS and Passport

1.

function isLoggedIn(req, res, next) {
  if (req.isAuthenticated()) {
    return next()
  } else {
    res.redirect('/login')
  }
}

2.

function isLoggedIn(req, res, next) {
  if (req.isAuthenticated()) {
    return true
  }
  return false
}

3.

router.get('/', function(req, res) {
  if (isLoggedIn) {
    res.render('index', {
      username: req.user.username
    })
  } else {
    res.render('index')
  }
})

Answer 1

You are pretty much doing the right but calling the method isLoggedIn like a variable. I have corrected the same below.

2 .

function isLoggedIn(req, res, next) {
  if (req.isAuthenticated()) {
    return true;
  }

  return false;
}

3 .

router.get('/', function(req, res, next) {
  if (isLoggedIn(req, res, next)) {
    res.render('index', {
      username: req.user.username
    });
  } else {
    res.render('index');
  }
});

Also, you can refactor the isLoggedIn method as below.

function isLoggedIn(req, res, next) {
    return req.isAuthenticated();
}