TypeError: db.collection is not a function

[Vlad Bukov]

Why do I get this error  "db.collection is not a function" when starting this example? 

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

test = require('assert');

MongoClient.connect('mongodb://localhost:27017/test', function(err, db) {

// Create a collection we want to drop later

var collection = db.collection('simple_query');

// Insert a bunch of documents for the testing

collection.insertMany([{a:1}, {a:2}, {a:3}], {w:1}, function(err, result) {

test.equal(null, err);

// Perform a simple find and return all the documents

collection.find().toArray(function(err, docs) {

test.equal(null, err);

test.equal(3, docs.length);

db.close();

});

});

});

[Jorge Mayo Martín]

Hi Vlad,

  since the version 3.0 of node-mongodb-native driver the way to connect to the mongodb server is a little bit different; check this link: http://mongodb.github.io/node-mongodb-native/3.0/quick-start/quick-start/#connect-to-mongodb

Maybe check too the error object first of use the db connection; for example:

if (err) return process.exit(1)