mongo-connect error with mongo-connect(session)

Question

After searching around about it, I can't find any solution or mistake in my code about this error. I've got my app.js files inside my node JS application with the mongo-connect declaration :

const MongoStore = require('connect-mongo')(session)

And I've got this error :

TypeError: Class constructor MongoStore cannot be invoked without 'new' at Object. (/Users/souhailmohamed/project/devops/story website/app.js:11:20) at Module._compile (internal/modules/cjs/loader.js:1063:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10) at Module.load (internal/modules/cjs/loader.js:928:32) at Function.Module._load (internal/modules/cjs/loader.js:769:14) at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12) at internal/main/run_main_module.js:17:47

There is my app.use code beloww :

app.use(session({
    secret: 'story book',
    resave: false,
    saveUninitialized: false,
    store: new MongoStore({ mongooseConnection: mongoose.connection })
}))

I understand pretty well about the

const MongoStore = require('connect-mongo')(session)

but I didn't understand the error. But it's from a tutorial from youtube by traversy media LinK

What's on the line 11 in app.js? That's the line it complains about. — Molda, Mar 16 '21 at 12:17
In line 11 i've : ```const MongoStore = require('connect-mongo')(session)``` — Souhail Mohamed, Mar 16 '21 at 12:24
It looks like they changed what the module exports then. You might have different version then in the video. In docs it shows `const MongoStore = require('connect-mongo'); Mongostore.create(....);` nothing about `require('connect-mongo')(session)` — Molda, Mar 16 '21 at 12:29
Ok i see, i'll check what's the new way to write it but i've already to do something like : ```const MongoStore = require('connect-mongo') const MongoStoreFinal = MongoStore(session) ``` and still won't work... — Souhail Mohamed, Mar 16 '21 at 12:46

abernier · Accepted Answer · 2021-05-21T06:44:41.493

20

connect-mongo v4 introduces new signature (compared to v3).

Here is the official migration guide.

Also, here is a quick diff of what I changed in my specific project (using mongoose and dotenv) to upgrade from connect-mongo v3 to v4:

edited May 21 '21 at 06:44

answered May 21 '21 at 06:39

abernier

27,030
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it worked, and I can see you were following the same tutorial created 2 years ago, which demands some update now. – seedme Apr 04 '22 at 11:26
@seedme what tutorial are you talking about? Because no, it's not related to any tutorial... – abernier Apr 06 '22 at 05:42
I'm also following the same tutorial and this solution is working for me thanks. – Ismail Hamdach Jul 06 '22 at 07:57

score 12 · Answer 2 · answered Apr 10 '21 at 23:07

I had the same problem in my code and solved it using this:

const MongoDbStore = require('connect-mongo');

Remove (session) from the require statement and update the app.use() like this:

// Session Config
app.use(
    session({
        secret: 'story book',
        resave: false,
        saveUninitialized: false,
        store: MongoDbStore.create({
            mongoUrl: YourDatabaseURL
        })
    })
);

score 5 · Answer 3 · edited Apr 26 '22 at 05:51

I was following the same so I discovered an npm pakage connect-mongodb-session. Install it and use the same code of session as Brad uses in his video

const MongoDBStore = require('connect-mongodb-session')(session);

//sessions
app.use(session({
    secret: 'keyboard cat',
    resave: false,
    saveUnitialized: false,
    store: new MongoDBStore({
        mongooseConnection: mongoose.connection
    })
    //cookie: { secure: true }
}))

const store = new MongoStore({
    uri: 'your mongo uri' ,
    collection:'mySessions'
})

//express middleware
app.use(session({
    secret: 'keyboard cat',
    resave: false,
    saveUninitialized: false,
    store: store

// Don't create a session until something is stored 
// cookie: { secure: true } - this wont work without https
}))

It solved my relogging issue also. If you close the tab and renter to localhost you get yourself logged in already

score 2 · Answer 4 · answered Mar 16 '21 at 13:00

Ok so i've found a way to resolve it, i don't about the reason, on which version of express to use but i removed the (session) after mongo-connect and change the app.use to this :

app.use(session({
    secret: 'story book',
    resave: false,
    saveUninitialized: false,
    store: MongoStore.create({ mongoUrl: 'mongodb+srv://<id+ password>@cluster0.cq7f2.mongodb.net/DBname?retryWrites=true&w=majority' })
}))

score 2 · Answer 5 · answered May 26 '21 at 18:30

Certain rule are changed for the syntax in "connect-mongo" document here

const MongoStore = require("connect-mongo");

  secret: 'keyboard cat',
  resave: false,
  saveUninitialized: false,
  store: MongoStore.create({
    mongoUrl: process.env.MONGO_URI  //(URI FROM.env file)
  })
  //stroed it in database
}));

score 2 · Answer 6 · edited Aug 14 '21 at 22:19

2

In your app.js make the following changes:

let MongoStore = require('connect-mongo');

app.use(
    session({
        secret: 'keyboard cat',
        resave: false,
        saveUninitialized: false,
        store: MongoStore.create({
            mongoUrl: 'your mongo url'
        })
    });
);

References:

https://www.npmjs.com/package/connect-mongo

edited Aug 14 '21 at 22:19

Tyler2P

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answered Aug 14 '21 at 17:15

Anurav modak

31
2

score 2 · Answer 7 · answered Jul 01 '22 at 18:43

It seems that 'connect-mongo' is obsolete and the newer version includes 'connect-mongodb-session'

const MongoDBStore = require('connect-mongodb-session')(session);

Use the above code instead and it should work without any errors.

Note: install the 'connect-mongodb-session' package using npm init connect-mongodb-session

score 1 · Answer 8 · answered May 02 '21 at 08:16

1

I have same problem. Here is the solution:

var session = require('express-session');
var MongoStore = require('connect-mongo');
var mongoose = require('mongoose');
mongoose.Promise = global.Promise;


app.use(session({
  secret : 'mysecretkey',
  resave : true,
  saveUninitialized : true,
  store :MongoStore.create({ mongoUrl: DBUrl })
}));

answered May 02 '21 at 08:16

Saeed

21
2

Please try to give proper explanation of the answer. – Tyler2P May 03 '21 at 09:03

score 1 · Answer 9 · answered Aug 14 '21 at 11:21

1

app.use(session({
  store: MongoStore.create({ mongoUrl: 'mongodb://localhost/test-app' })
}));

// Advanced usage
app.use(session({
  store: MongoStore.create({
    mongoUrl: 'mongodb://user12345:foobar@localhost/test-app?authSource=admin&w=1',
    mongoOptions: advancedOptions // See below for details
  })
}));

answered Aug 14 '21 at 11:21

Harish Nishad

11
2

1

Please don't post only code as answer, but also provide an explanation what your code does and how it solves the problem of the question. Answers with an explanation are usually more helpful and of better quality, and are more likely to attract upvotes. – Tyler2P Aug 14 '21 at 19:18

score 0 · Answer 10 · answered Apr 25 '21 at 00:16

Here is the solution:

const session = require('express-session');
const MongoStore = require('connect-mongo');
const mongoose = require('mongoose');

app.use(session({
    secret: 'story book',
    resave: false,
    saveUninitialized: false,
    store: new MongoStore({
      mongoUrl: mongoose.connection._connectionString,
      mongoOptions: {}
    })
}))

score 0 · Answer 11 · answered Nov 24 '21 at 20:28

0

Just use the another npm package connect-mongodb-session and it should work https://www.npmjs.com/package/connect-mongodb-session

const MongoDBStore = require('connect-mongodb-session')(session);

answered Nov 24 '21 at 20:28

Piyush Chandra

159
1
4

mongo-connect error with mongo-connect(session)

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