mongdb TypeError: db.collection is not a function

Question

When I run this code it has a Error 'TypeError: db.collection is not a function'. How to solve this problem and where is wrong in this code.

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

// Connection url
const url = 'mongodb://localhost:27017/blog';

// Connect using MongoClient
MongoClient.connect(url, (err, db) => {
  const note = {
    text: 'Note content text',
    title: 'Note title'
  };
  
  db.collection('notes').insert(note, (err, result) => {
    if (err) {
      console.log('An error has occurred!')
    } else {
      console.log('Insert success!')
    }
  });
});

You should add a if (err) { console.log('Could not connect'); } in the callback when you connect. It may be the case that it can't connect and that is why db doesn't have the collection function set up. — maxpaj
– maxpaj, Commented Dec 7, 2017 at 9:19
Add if (err) { console.log(err); } to log the error & find what's the problem — Vishant dhandha
– Vishant dhandha, Commented Dec 7, 2017 at 9:28
This is because you are using v3.0 of the mongodb driver. The answer is here. — Mika Sundland
– Mika Sundland, Commented Dec 7, 2017 at 13:41

Taimoor · Accepted Answer · 2017-12-07 11:26:59Z

8

It's mongodb version error which you have installed in your project. You should run npm install [email protected] --save in your project

answered Dec 7, 2017 at 11:26

Taimoor

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4 Comments

Amit Shah Over a year ago

Installed mongodb server version: v3.2.18 mongodb npm version: ^3.0.0-rc0 Can you please advice where can i find proper documentation with connection code examples? I am also facing same error.

Amit Shah Over a year ago

found the answer here : stackoverflow.com/questions/47662220/…

Pini Over a year ago

Great answer, but how can I make it work with newer version of mongodb? (what should I change?)

Taimoor Over a year ago

mongoose.Promise = global.Promise; mongoose.connect('mongodb://localhost/test'); mongoose.connection.on('error', () => { console.log('MongoDB connection error. Please make sure MongoDB is running.'); process.exit(1); });

marnutux · Accepted Answer · 2017-12-12 18:07:57Z

7

For people on version 3.0 of the MongoDB native NodeJS driver:

In version 2.x of the MongoDB native NodeJS driver you would get the database object as an argument to the connect callback:

MongoClient.connect('mongodb://localhost:27017/blog', (err, db) => {
  // Database returned
});

According to the changelog for 3.0 you now get a client object containing the database object instead:

MongoClient.connect('mongodb://localhost:27017', (err, client) => {
  // Client returned
  var db = client.db('blog');
});

Original Answer: https://stackoverflow.com/a/47662979/2272082

answered Dec 12, 2017 at 18:07

marnutux

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2 Comments

logos_164 Over a year ago

This is a better answer because of the update to version 3.0. Do you have mongodb documentation on this?

Yousaf Hassan Over a year ago

Thank you so much @marnutux finally this solution worked for me after trying many.

Nikhil Patel · Accepted Answer · 2019-01-11 08:27:21Z

1

check out with this one it might help you out to get closer to your needy solution.

const url = 'mongodb://localhost:27017/learnyoumongo'

var mongo = require('mongodb').MongoClient

mongo.connect(url, function(err, client) {
      if(err) {
         throw err;
      }
      var collection = client.db('learnyoumongo').collection('parrots');
        collection.find({
          age : {
            $gt : +process.argv[2]
          }
        }).toArray(function(err, documents) {
        console.log(documents)
        client.close()
   })
})

answered Jan 11, 2019 at 8:27

Nikhil Patel

113 bronze badges

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