How to use MongoDB with promises in Node js

0 votes

I've been trying to discover how to use MongoDB with Node.js and in the docs it seems the suggested way is to use callbacks. Now, I know that it is just a matter of preference, but I really prefer using promises.

The problem is that I didn't find how to use them with MongoDB. Indeed, I've 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.

Is there any way to use mongo db inside Node with promises instead of callbacks?

Oct 11, 2020 in Node-js by kartik
• 37,510 points
92 views

1 answer to this question.

0 votes

Hello @kartik,

Try this:

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) {})

Hope it helps!!
Thank you!!

answered Oct 11, 2020 by Niroj
• 82,720 points

Related Questions In Node-js

0 votes
1 answer

How to write files in Node.js?

Hello @kartik, Currently there are three ways to ...READ MORE

answered Jul 8, 2020 in Node-js by Niroj
• 82,720 points
177 views
0 votes
1 answer

How to get GET (query string) variables in Express.js on Node.js?

Hello @kartik, Since you've mentioned Express.js in your ...READ MORE

answered Jul 8, 2020 in Node-js by Niroj
• 82,720 points
1,205 views
0 votes
1 answer

How to uninstall npm modules in node js?

Hello @kartik, The command is simply: npm uninstall ...READ MORE

answered Jul 8, 2020 in Node-js by Niroj
• 82,720 points
1,259 views
0 votes
1 answer

How do I get the path to the current script with Node.js?

Hello @kartik, you can do this: fs.readFile(path.resolve(__dirname, 'settings.json'), 'UTF-8', ...READ MORE

answered Jul 8, 2020 in Node-js by Niroj
• 82,720 points
1,221 views
0 votes
1 answer

jQuery AJAX fires error callback on window unload - how do I filter out unload and only catch real errors?

Hello, In the error callback or $.ajax you have three ...READ MORE

answered Apr 27, 2020 in Java-Script by Niroj
• 82,720 points
900 views
0 votes
1 answer

How do I pass command line arguments to a Node.js program?

Hello @kartik, If your script is called myScript.js ...READ MORE

answered May 5, 2020 in Java-Script by Niroj
• 82,720 points
1,346 views
0 votes
1 answer

Error:Issue when trying to use IN() in wordpress database

Hello @kartik, Try this code : // Create an ...READ MORE

answered May 8, 2020 in PHP by Niroj
• 82,720 points
172 views
+2 votes
1 answer

How do I debug Node.js applications?

Hello @kartik, Use node-inspector  from any browser supporting WebSocket. Breakpoints, ...READ MORE

answered Jul 8, 2020 in Node-js by Niroj
• 82,720 points
174 views
0 votes
1 answer

How to paginate with Mongoose in Node.js?

Hello @kartik, You can chain just like that: var ...READ MORE

answered Jul 15, 2020 in Node-js by Niroj
• 82,720 points
107 views
0 votes
1 answer

How to read environment variables in Node.js?

Hello @kartik, Yes,you can read environment variables in Node.js ...READ MORE

answered Jul 8, 2020 in Node-js by Niroj
• 82,720 points
350 views