how to get the path of a file in nodejs code example

Example 1: node get path of current file

module.filename

Example 2: get value from path variable node js

exports.doIt = function(req, res, next) {
    var group = new Group(req.body);

    console.log(req.params);

    group.userId = req.params.userId;

    group.save(new dataCallbacks(req, res, next, "Group").insert());
});