TypeError: db.collection is not a function

Question

I am trying to post data to database that I have created on mLab and I am getting this error but I don\'t know whats going wrong.I also have read previously asked question o

Answer 1

I've simple solution:

note_routes.js

db.collection('notes').insert(note, (err, result) => {

replace

db.db().collection('notes').insert(note, (err, result) => {

Answer 2

I ran into the same issue. It looks like the mongodb driver module for node was updated since the video was created. I found the code below in the docs which works.

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

var url = 'mongodb://localhost:27017/<dbName>';
MongoClient.connect(url, (err, db) => {
   db.collection('<collection-name>').find({}).toArray(function(err, docs) {

    // Print the documents returned
    docs.forEach(function(doc) {
        console.log(doc);
    });

    // Close the DB
    db.close();
    });

});  

is replaced with

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

  var url = 'mongodb://localhost:27017'; // remove the db name.
    MongoClient.connect(url, (err, client) => {
       var db = client.db(dbName);
       db.collection('<collection-name>').find({}).toArray(function(err, docs) {

        // Print the documents returned
        docs.forEach(function(doc) {
            console.log(doc);
        });

        // Close the DB
        client.close();
        });

    });  

Here is a link to the latest docs in case we run into further syntax issues.

Answer 3

The error is in the mongodb library. Try to install version 2.2.33 of mongodb. Delete your node_modules directory and add

"dependencies": {
   "mongodb": "^2.2.33"
}

Then

npm install

and there you are

Answer 4

MongoClient.connect(uristring, function (err, database) {
      var db=database.db('chatroomApp');
      var collections=db.collection('chats');
});

Need to Get the Database first before trying to access the collections.

Answer 5

MongoClient.connect(db.url,(err,database) =>{
    if (err) return console.log(err)
    //require('./app/routes')(app,{});
    //try this 
     require('./app/routes')(app,database);
    app.listen(port,() => {
        console.log("We are live on"+port); 
    });
})

here you have to include the database in the empty {}.

or

you can also try installing mongodb to latest which will solve the issue.

npm install mongodb@2.2.33 --save 

else npm install add dependency of "mongodb": "^2.2.33" in node modules.

Answer 6

Dont use database name in connection url:

const mongo_url = 'mongodb://localhost:27017'

Instead use below method:

MongoClient.connect(mongo_url , { useNewUrlParser: true }, (err, client) => {
        if (err) return console.log(err)
        const  db =  client.db('student')
        const collection = db.collection('test_student');
        console.log(req.body);
        collection.insertOne(req.body,(err,result)=>{
            if(err){
                res.json(err);
            }
            res.json(result);
        });
    });