Node module not recognize as module

Question

I have file, which I believe should be imported as a module, but it when I try to import into my main file (see main.js), I get the follow error:

 Error: Cannot find module 'sessionStore.js'

I'm made sure that the file in in the correct location. Any ideas what else could cause this?

main.js

var express = require('express');
var bodyParser = require('body-parser');
var util = require('util');
var toMarkdown = require('to-markdown');
var jsdiff = require('diff');
var marked = require('marked');
var pg = require('pg');
//need to get sessions to work and use server credentials instead of password
var sessionStore = require('sessionStore.js');
var PodioJS = require('podio-js').api;
var podio = new PodioJS({authType: 'password', clientId: "xxx", clientSecret: "xxx" },{sessionStore:sessionStore});

sessionStore.js

var fs = require('fs');
var path = require('path');

function get(authType, callback) {
  var fileName = path.join(__dirname, 'tmp/' + authType + '.json');
  var podioOAuth = fs.readFile(fileName, 'utf8', function(err, data) {

    // Throw error, unless it's file-not-found
    if (err && err.errno !== 2) {
        throw new Error('Reading from the sessionStore failed');
    } else if (data.length > 0) {
      callback(JSON.parse(data));
    } else {
      callback();
    }
  });
}

function set(podioOAuth, authType, callback) {
  var fileName = path.join(__dirname, 'tmp/' + authType + '.json');

  if (/server|client|password/.test(authType) === false) {
    throw new Error('Invalid authType');
  }

  fs.writeFile(fileName, JSON.stringify(podioOAuth), 'utf8', function(err) {
    if (err) {
      throw new Error('Writing in the sessionStore failed');
    }

    if (typeof callback === 'function') {
      callback();
    }
  });
}

module.exports = {
  get: get,
  set: set
};

Answer 1

have you tried using relative paths? If they're in the same directory, then

var sessionStore = require('./sessionStore');

without the .js