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There are two ways to verify if a user is authenticated:

1. Using the passport.authenticate() method, specifying 'JWT' as the strategy in the route declaration.

Example:

app.post('/route',  passport.authenticate('jwt',  { session: false}),  function(req,  res) { });

After the passport.authenticate() method is called, the user object is accessible via req.user

2. Check if the request header has the JSON web token (JWT).

Example:

getToken = function (headers) {
    if (headers && headers.authorization) {
        var parted = headers.authorization.split(' ');
        if (parted.length === 2) {
            return parted[1];
        } else {
            return null;
        }
    } else {
        return null;
    }
};

var token = getToken(req.headers);
if (token) {
    var decoded = jwt.decode(token, config.get(mongodb.secret));
}