[Solved] How can i get result from export module using async/await

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Return a promise from your config.js file. mongodb client supports promises directly, just do not pass the callback parameter and use then.

config.js

module.exports = (app) => {
  const mongo_client = require('mongodb').MongoClient;
  const assert = require('assert');

  const url="mongodb://localhost:27017";
  const db_name="portfolio";

  return mongo_client.connect(url).then(client => {
    assert.equal(null, err);
    console.log('Connection Successfully to Mongo');
    return client.db(db_name);
  });
};

And call then and do the rest in the promise handler:

main.js

var express = require('express')
var app = express();

// Web server port number.
const port = 4343;

require('./config/app_config')(app).then(db => {
  db.collection('users');
});

// as Bergi suggested in comments, you could also move this part to `then` 
// handler to it will not start before db connection is estabilished
app.listen(port, () => {
  console.log(`Server start at port number: ${port}`);
});

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solved How can i get result from export module using async/await