I am using express and Node.js. When I run the function below to get the value of an URL,
Json.stringify(url) gives me the error.

ReferenceError: Json is not defined.

app.get(/id, function (req, res, next) {

    var id = req.param(id);

    connection.query('SELECT `url` FROM dynamic_url where id =' + req.param(id), function (error, rows, fields) {

        if (err) {

            return next(err);

        }

        var url;

        if (rows.length === 0) {

            url = 'URL not available in database'

        } else {

            url = rows[0].url;

        }

        var i = Json.stringify(url);

        res.redirect(i);

    });

});