db.collection is not a function

Question

I am trying to simply insert an entry in a MongoDB collection using Nodejs. Here is my code:

code:

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

MongoClient.connect('mongodb://localhost:27017/TodoApp', (err, db) => {
  if (err) {
    return console.log('Unable to connect to MongoDB server');
  }
  console.log('Connected to MongoDB server');

  db.collection('Todos').insertOne({
    text: 'Something to do',
    completed: false
  }, (err, result) => {
    if (err) {
      return console.log('Unable to insert todo', err);
    }

    console.log(JSON.stringify(result.ops, undefined, 2));
  });

  db.close();
});

When I run the code, it showing the following error:

error:

TypeError: db.collection is not a function

Seems related: https://stackoverflow.com/questions/47662220/db-collection-is-not-a-function-when-using-mongoclient-v3-0?rq=1 — raina77ow, Dec 22 '17 at 06:51
Possible duplicate of [db.collection is not a function when using MongoClient v3.0](https://stackoverflow.com/questions/47662220/db-collection-is-not-a-function-when-using-mongoclient-v3-0) — Mika Sundland, Dec 22 '17 at 11:01

score 6 · Accepted Answer · answered Dec 22 '17 at 06:56

Uninstalling existing mongodb package and reinstalling using the following commands resolved the issues

npm uninstall mongodb --save
npm install mongodb@2.2.33 --save

Version MongoDB >= 3 - That database variable is actually the parent object of the object you are trying to access. If u using mongo 3+:

const myDb = db.db('YourDatabase') 
myDb.collection('YourDatabase).insertOne ....

score 2 · Answer 2 · answered Dec 22 '17 at 06:51

2

you can rewrite your code as follow

MongoClient.connect(url,(err,db) =>{ 
  const database= db.db('TodoApp')
  database.collection('Todos').insertOne({})
}

answered Dec 22 '17 at 06:51

edkeveked

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score 1 · Answer 3 · answered Sep 21 '18 at 13:53

The reason for this error is the version of the NodeJs Driver. TypeError: db.collection is not a function. If the version is > 3.0.1 then you have to change the db to client. For more info check this page, it helped me! [db.collection is not a function when using MongoClient v3.0

Hope that helps!

db.collection is not a function

3 Answers3