How do I exports node modules ?

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I am reading directory and exporting file names using callbacks but my module is not sending data when i import readDirectory function, Any idea what is going wrong with below code ? my callback return values in module itself but its not sending while using exports.

What I have tried:

main.js

var fs = require('fs');
var path = './Logs';
function readDirectory() {
fs.readdir(path, function(err,items) {
return filesData(items);
});
}
function filesData(items) {
var data = JSON.stringify(items)
console.log('data from module',data);
return data;

}
exports.readDirectory = readDirectory;

app.js

var readDirectory = require('./main');
var obj = readDirectory.readDirectory();

console.log(JSON.stringify(obj));

Posted 30-Jun-16 5:25am

Member 12612408

Updated 30-Jun-16 20:14pm

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Mayank_Gupta_ · Answer 1 · 2016-06-30T20:14:00

Try executing the following code:

directoryOps.js

(function(directoryOps) {

  var fs = require('fs');
  var path = './Logs';

  function filesData(items) {
    var data = JSON.stringify(items)
    console.log('data from module',data);
    return data;
  }

  directoryOps.readDirectory = function() {
    fs.readdir(path, function(err,items) {
      return filesData(items);
    });
  };

})(module.exports);

App.js

var directoryOps = require('./directoryOps');
var obj = directoryOps.readDirectory();

Sorry for the changes I made in the file name.

**Note:

Also the way you are currently creating "main.js", it would add variables like "fs, path, filesData, readDirectory" to the global scope and hence polluting it . So its better to execute the function as a part of IIFE (anonymous function). This would not add variable to the global scope, keeping your scope clean.

Hope it helps...