How to use MongoDB with promises in Node.js?

Question

I want to use MongoDB with Node.js and in the official documents it is suggesting to use callbacks. Now, I know that it is just a matter of preference, but I really prefer using promises.

I have tried the following:

var MongoClient = require('mongodb').MongoClient;

var url = 'mongodb://localhost:27017/example';

MongoClient.connect(url).then(function (err, db) {

    console.log(db);

});

And the result is undefined. In that case it seems this is not the way to do so.

Can you help me?

Answer 1

The approach that you are implementing is correct but there is only one mistake that you have done in the argument. Refer the following code:

var MongoClient = require('mongodb').MongoClient

var url = 'mongodb://localhost:27017/example'

MongoClient.connect(url)

  .then(function (db) { // <- db as first argument

    console.log(db)

  })

  .catch(function (err) {})

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