var username = req.body.username;
var password = req.body.password;

User.getUserByUsername(username,(err, user)=>{
    if(err)
        throw err;
    if(!user)
        return res.json({success: false, msg: "User with username "+ username+" doesn't exist"});

    User.comparePassword(password, user.password, (err, passwordsMatched) =>{
        // Prints that user is type of object
        console.log("Type of user: "+typeof(user));
        if(err) throw err;

        if(passwordsMatched){
            // line bellow throws error that it expects object when I pass user
            var token = jwt.sign(user, Config.secret, {expiresIn: 604800});
            res.json({
                success: true,
                token: 'JWT '+token,
                user: {
                    name : user.name,
                    username: user.username
                }
            });
        }else{
            return res.json({success: false, msg: "Password doesn't match"});
        }
    });
});

var token = jwt.sign({_id : user._id,
                      username: user.username,
                      password: user.password
                     },
                     Config.secret,
                     {expiresIn: 604800});