how to send json as a response after passport authenticationin node.js

Question

I am trying this git example.

Which works well when I integrated it with my project, but what I want to achieve is to send json as a response to the client/request,

Answer 1

Use passport as a middleware.

router.get('/auth/callback', passport.authenticate('facebook'), 
    function(req, res){
        if (req.user) { res.send(req.user); }
        else { res.send(401); }
    });