Node JS - Calling a method from another method in same file

You can do it this way:

module.exports = {

  foo: function(req, res){

    bar();

  },
  bar: bar
}

function bar() {
  ...
}

No closure is needed.

The accepted response is wrong, you need to call the bar method from the current scope using the "this" keyword:

    module.exports = {
      foo: function(req, res){

        this.bar();

      },
      bar: function() { console.log('bar'); }
    }

I think what you can do is bind the context before passing the callback.

something.registerCallback(module.exports.foo.bind(module.exports));

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