MongoDB - Error: invalid schema, expected mongodb

user_5182710 0
Viewed 52473

I'm new in building application with MEAN Stack, I'm trying to build a real time chat app, here is my server side :

console.log("Server running...!");

var mongo=require('mongodb').MongoClient;
var client=require('socket.io').listen(8080).sockets;

mongo.connect('localhost:27017/db/chat',function(err,db){
if(err)  throw err;

client.on('connection',function(socket){
console.log('someone has connected !');

//waiting for input
socket.on('input',function(data){
console.log(data);
});

});

});

I am sure that i created a data base called chat with mongodb, also mongo is waiting for connection. But when i run the server with node server.js an error occurs : 

Server running...!
C:\Users\azus\Desktop\Psirt\codemaster\node_modules\ mongodb\lib\url_parser.js:20
  throw new Error('invalid schema, expected mongodb');
  ^

Error: invalid schema, expected mongodb
at module.exports (C:\Users\azus\Desktop\Psirt\code-master\node_modules\mong
 odb\lib\url_parser.js:20:11)
at connect (C:\Users\azus\Desktop\Psirt\code-master\node_modules\mongodb\lib
 \mongo_client.js:125:16)
at Function.MongoClient.connect (C:\Users\azus\Desktop\Psirt\code-master\nod
e_modules\mongodb\lib\mongo_client.js:109:3)
at Object.<anonymous> (C:\Users\azus\Desktop\Psirt\code-master\server.js:6:8
)
at Module._compile (module.js:413:34)
at Object.Module._extensions..js (module.js:422:10)
at Module.load (module.js:357:32)
at Function.Module._load (module.js:314:12)
at Function.Module.runMain (module.js:447:10)
at startup (node.js:139:18)

C:\Users\azus\Desktop\Psirt\code-master>

I had been blocked at this phase for weeks, could anyone help on this?

Thanks.

mean-stack node.js mongodb
9 Answers

Just figured out the same problem. Damned windows save quotes in environment.

So if you use windows and wrote this way SET MONGO_URL="mongodb://localhost:27017/{name of your db}" It is not correct.

Correct way is SET MONGO_URL=mongodb://localhost:27017/{name of your db} without quotes.

Also i discovered that you must write protocol exactly - mongodb. There is code what check the protocol from file url_parser.js

var result = parser.parse(url, true);

if(result.protocol != 'mongodb:') {
    throw new Error('invalid schema, expected mongodb');
}
user_79185430

the working code would be like this

don't forget to replace username, password & URL

const socketClient = require('socket.io').listen(4000).sockets;
const MongoClient = require('mongodb').MongoClient;

const uri = "mongodb+srv://<username>:<password>@cluster0-saugt.mongodb.net/test?retryWrites=true&w=majority";

const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect(err => {
    socketClient.on('connection', function (socket) {

        //Need to Get the Database first before trying to access the collections.
        let chat = client.db("test").collection('chats');

        // Get chats from mongo collection
        // perform actions on the collection object
        chat.find().limit(100).sort({ _id: 1 }).toArray(function (err, res) {
            if (err) {
                throw err;
            }

            // Emit the messages
            socket.emit('output', res);
        });


    });

});
user_68393310

Change content of this line from

mongo.connect('localhost:27017/db/chat',function(err,db)

to

mongo.connect('mongodb://localhost:27017/db/chat',function(err,db)

Then you can connect MongoDB database successfully.

user_59185390

update your mongodb npm version

user_31664170
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