Failing to connect to MongoDB hosted on mlab

Background

Making a small web app that connects to a Mongo DB hosted with Mlab. I've created the DB on mlab, and created users with read/write permission. I've also created a users collection with several records.

The Problem

When I try and connect to the database using the code on mongo.github.io, I hit the error:

/home/ed/dev/mongo-demo/node_modules/mongodb/lib/operations/mongo_client_ops.js:466

      throw err;

      ^



TypeError: Cannot read property 'db' of null

The Code

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

const url = 'mongodb://<user>:<pass>@ds115434.mlab.com:15434';



// Database Name

const dbName = 'princee3-music';



// Use connect method to connect to the server

MongoClient.connect(url, function(err, client) {

  console.log("Connected successfully to server");



  const db = client.db(dbName);



  client.close();

});

What I Have Tried

Oddly, if I connect through the shell using:

mongo ds115434.mlab.com:15434/princee3-music -u <dbuser> -p <dbpassword>

That works fine, or if I wrap the connection in an anonymous self-calling async function, it also connects.

Async Wrapper

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

const mongoUrl = 'mongodb://<user>:<pass>@ds115434.mlab.com:15434/';

const dbName = 'princee3-music';



(async() => {

   const client = await MongoClient.connect(mongoUrl, { useNewUrlParser: true});

   const db = client.db(dbName);

   db.collection('users').insertOne({

     email: user.email,

     pass: hashedPassword,

     admin: true

   }, (err, result) => {

     if (err) {

       reject({error: err});

     } else {

       resolve({message: 'okay'});

     }

   });

   client.close();

 })();

Any pointers on where I may be going wrong would be great.

asked Nov 25 '18 at 13:13

Ed Prince

3471520

Can you please give me the output of console.log(err) to be placed above const db = client.db(dbName)?

– Asten Mies
Nov 25 '18 at 13:21

{ MongoError: Authentication failed.

– Ed Prince
Nov 25 '18 at 13:23

Why are you not satisfied with async? It makes sense to wait for the connection to effectively occur before doing anything in there...

– Asten Mies
Nov 25 '18 at 13:29

add a comment |

Background

The Problem

When I try and connect to the database using the code on mongo.github.io, I hit the error:

/home/ed/dev/mongo-demo/node_modules/mongodb/lib/operations/mongo_client_ops.js:466

      throw err;

      ^



TypeError: Cannot read property 'db' of null

The Code

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

const url = 'mongodb://<user>:<pass>@ds115434.mlab.com:15434';



// Database Name

const dbName = 'princee3-music';



// Use connect method to connect to the server

MongoClient.connect(url, function(err, client) {

  console.log("Connected successfully to server");



  const db = client.db(dbName);



  client.close();

});

What I Have Tried

Oddly, if I connect through the shell using:

mongo ds115434.mlab.com:15434/princee3-music -u <dbuser> -p <dbpassword>

That works fine, or if I wrap the connection in an anonymous self-calling async function, it also connects.

Async Wrapper

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

const mongoUrl = 'mongodb://<user>:<pass>@ds115434.mlab.com:15434/';

const dbName = 'princee3-music';



(async() => {

   const client = await MongoClient.connect(mongoUrl, { useNewUrlParser: true});

   const db = client.db(dbName);

   db.collection('users').insertOne({

     email: user.email,

     pass: hashedPassword,

     admin: true

   }, (err, result) => {

     if (err) {

       reject({error: err});

     } else {

       resolve({message: 'okay'});

     }

   });

   client.close();

 })();

Any pointers on where I may be going wrong would be great.

asked Nov 25 '18 at 13:13

Ed Prince

3471520

Can you please give me the output of console.log(err) to be placed above const db = client.db(dbName)?

– Asten Mies
Nov 25 '18 at 13:21

{ MongoError: Authentication failed.

– Ed Prince
Nov 25 '18 at 13:23

Why are you not satisfied with async? It makes sense to wait for the connection to effectively occur before doing anything in there...

– Asten Mies
Nov 25 '18 at 13:29

add a comment |

Background

The Problem

When I try and connect to the database using the code on mongo.github.io, I hit the error:

/home/ed/dev/mongo-demo/node_modules/mongodb/lib/operations/mongo_client_ops.js:466

      throw err;

      ^



TypeError: Cannot read property 'db' of null

The Code

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

const url = 'mongodb://<user>:<pass>@ds115434.mlab.com:15434';



// Database Name

const dbName = 'princee3-music';



// Use connect method to connect to the server

MongoClient.connect(url, function(err, client) {

  console.log("Connected successfully to server");



  const db = client.db(dbName);



  client.close();

});

What I Have Tried

Oddly, if I connect through the shell using:

mongo ds115434.mlab.com:15434/princee3-music -u <dbuser> -p <dbpassword>

That works fine, or if I wrap the connection in an anonymous self-calling async function, it also connects.

Async Wrapper

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

const mongoUrl = 'mongodb://<user>:<pass>@ds115434.mlab.com:15434/';

const dbName = 'princee3-music';



(async() => {

   const client = await MongoClient.connect(mongoUrl, { useNewUrlParser: true});

   const db = client.db(dbName);

   db.collection('users').insertOne({

     email: user.email,

     pass: hashedPassword,

     admin: true

   }, (err, result) => {

     if (err) {

       reject({error: err});

     } else {

       resolve({message: 'okay'});

     }

   });

   client.close();

 })();

Any pointers on where I may be going wrong would be great.

asked Nov 25 '18 at 13:13

Ed Prince

3471520

Background

The Problem

When I try and connect to the database using the code on mongo.github.io, I hit the error:

/home/ed/dev/mongo-demo/node_modules/mongodb/lib/operations/mongo_client_ops.js:466

      throw err;

      ^



TypeError: Cannot read property 'db' of null

The Code

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

const url = 'mongodb://<user>:<pass>@ds115434.mlab.com:15434';



// Database Name

const dbName = 'princee3-music';



// Use connect method to connect to the server

MongoClient.connect(url, function(err, client) {

  console.log("Connected successfully to server");



  const db = client.db(dbName);



  client.close();

});

What I Have Tried

Oddly, if I connect through the shell using:

mongo ds115434.mlab.com:15434/princee3-music -u <dbuser> -p <dbpassword>

That works fine, or if I wrap the connection in an anonymous self-calling async function, it also connects.

Async Wrapper

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

const mongoUrl = 'mongodb://<user>:<pass>@ds115434.mlab.com:15434/';

const dbName = 'princee3-music';



(async() => {

   const client = await MongoClient.connect(mongoUrl, { useNewUrlParser: true});

   const db = client.db(dbName);

   db.collection('users').insertOne({

     email: user.email,

     pass: hashedPassword,

     admin: true

   }, (err, result) => {

     if (err) {

       reject({error: err});

     } else {

       resolve({message: 'okay'});

     }

   });

   client.close();

 })();

Any pointers on where I may be going wrong would be great.

javascript node.js database mongodb mlab

asked Nov 25 '18 at 13:13

Ed Prince

3471520

asked Nov 25 '18 at 13:13

Ed Prince

3471520

asked Nov 25 '18 at 13:13

Ed Prince

3471520

asked Nov 25 '18 at 13:13

Ed Prince

3471520

asked Nov 25 '18 at 13:13

Ed Prince

3471520

Can you please give me the output of console.log(err) to be placed above const db = client.db(dbName)?

– Asten Mies
Nov 25 '18 at 13:21

{ MongoError: Authentication failed.

– Ed Prince
Nov 25 '18 at 13:23

Why are you not satisfied with async? It makes sense to wait for the connection to effectively occur before doing anything in there...

– Asten Mies
Nov 25 '18 at 13:29

add a comment |

Can you please give me the output of console.log(err) to be placed above const db = client.db(dbName)?

– Asten Mies
Nov 25 '18 at 13:21

{ MongoError: Authentication failed.

– Ed Prince
Nov 25 '18 at 13:23

Why are you not satisfied with async? It makes sense to wait for the connection to effectively occur before doing anything in there...

– Asten Mies
Nov 25 '18 at 13:29

Can you please give me the output of console.log(err) to be placed above const db = client.db(dbName)?

– Asten Mies
Nov 25 '18 at 13:21

{ MongoError: Authentication failed.

– Ed Prince
Nov 25 '18 at 13:23

Why are you not satisfied with async? It makes sense to wait for the connection to effectively occur before doing anything in there...

– Asten Mies
Nov 25 '18 at 13:29

add a comment |

1 Answer
1

active

oldest

votes

The official mLab docs advise to connect like below. It has to be asynchronous , in order to wait for the connection to occur, or the client will be null, thus throwing an error saying that it can’t read property db of null.

On the other hand, you async has useNewUrlParser which might be the key to have a successful connection, see this issue

MongoClient.connect(url, { useNewUrlParser: true }).then(client => client.db())

edited Nov 25 '18 at 13:50

answered Nov 25 '18 at 13:37

Asten Mies

543210

Still getting an authentication error when trying this way

– Ed Prince
Nov 25 '18 at 13:40

@EdPrince I have edited the answer, you may need useNewUrlParser depending on the version

– Asten Mies
Nov 25 '18 at 13:47

Tried, and still the same authentication failed

– Ed Prince
Nov 25 '18 at 13:53

@EdPrince if you guarantee that your async wrapper works then the only remaining difference is the trailing slash at the end of your mongoUrl. For the rest I can’t help any further sorry

– Asten Mies
Nov 25 '18 at 14:02

So it turns out you have to add the db name to the end of the URI, I hadn't realised that

– Ed Prince
Nov 25 '18 at 14:03

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

On the other hand, you async has useNewUrlParser which might be the key to have a successful connection, see this issue

MongoClient.connect(url, { useNewUrlParser: true }).then(client => client.db())

edited Nov 25 '18 at 13:50

answered Nov 25 '18 at 13:37

Asten Mies

543210

Still getting an authentication error when trying this way

– Ed Prince
Nov 25 '18 at 13:40

@EdPrince I have edited the answer, you may need useNewUrlParser depending on the version

– Asten Mies
Nov 25 '18 at 13:47

Tried, and still the same authentication failed

– Ed Prince
Nov 25 '18 at 13:53

@EdPrince if you guarantee that your async wrapper works then the only remaining difference is the trailing slash at the end of your mongoUrl. For the rest I can’t help any further sorry

– Asten Mies
Nov 25 '18 at 14:02

So it turns out you have to add the db name to the end of the URI, I hadn't realised that

– Ed Prince
Nov 25 '18 at 14:03

add a comment |

On the other hand, you async has useNewUrlParser which might be the key to have a successful connection, see this issue

MongoClient.connect(url, { useNewUrlParser: true }).then(client => client.db())

edited Nov 25 '18 at 13:50

answered Nov 25 '18 at 13:37

Asten Mies

543210

Still getting an authentication error when trying this way

– Ed Prince
Nov 25 '18 at 13:40

@EdPrince I have edited the answer, you may need useNewUrlParser depending on the version

– Asten Mies
Nov 25 '18 at 13:47

Tried, and still the same authentication failed

– Ed Prince
Nov 25 '18 at 13:53

@EdPrince if you guarantee that your async wrapper works then the only remaining difference is the trailing slash at the end of your mongoUrl. For the rest I can’t help any further sorry

– Asten Mies
Nov 25 '18 at 14:02

So it turns out you have to add the db name to the end of the URI, I hadn't realised that

– Ed Prince
Nov 25 '18 at 14:03

add a comment |

On the other hand, you async has useNewUrlParser which might be the key to have a successful connection, see this issue

MongoClient.connect(url, { useNewUrlParser: true }).then(client => client.db())

edited Nov 25 '18 at 13:50

answered Nov 25 '18 at 13:37

Asten Mies

543210

On the other hand, you async has useNewUrlParser which might be the key to have a successful connection, see this issue

MongoClient.connect(url, { useNewUrlParser: true }).then(client => client.db())

edited Nov 25 '18 at 13:50

answered Nov 25 '18 at 13:37

Asten Mies

543210

edited Nov 25 '18 at 13:50

answered Nov 25 '18 at 13:37

Asten Mies

543210

answered Nov 25 '18 at 13:37

Asten Mies

543210

answered Nov 25 '18 at 13:37

Asten Mies

543210

Still getting an authentication error when trying this way

– Ed Prince
Nov 25 '18 at 13:40

@EdPrince I have edited the answer, you may need useNewUrlParser depending on the version

– Asten Mies
Nov 25 '18 at 13:47

Tried, and still the same authentication failed

– Ed Prince
Nov 25 '18 at 13:53

@EdPrince if you guarantee that your async wrapper works then the only remaining difference is the trailing slash at the end of your mongoUrl. For the rest I can’t help any further sorry

– Asten Mies
Nov 25 '18 at 14:02

So it turns out you have to add the db name to the end of the URI, I hadn't realised that

– Ed Prince
Nov 25 '18 at 14:03

add a comment |

Still getting an authentication error when trying this way

– Ed Prince
Nov 25 '18 at 13:40

@EdPrince I have edited the answer, you may need useNewUrlParser depending on the version

– Asten Mies
Nov 25 '18 at 13:47

Tried, and still the same authentication failed

– Ed Prince
Nov 25 '18 at 13:53

@EdPrince if you guarantee that your async wrapper works then the only remaining difference is the trailing slash at the end of your mongoUrl. For the rest I can’t help any further sorry

– Asten Mies
Nov 25 '18 at 14:02

So it turns out you have to add the db name to the end of the URI, I hadn't realised that

– Ed Prince
Nov 25 '18 at 14:03

Still getting an authentication error when trying this way

– Ed Prince
Nov 25 '18 at 13:40

@EdPrince I have edited the answer, you may need useNewUrlParser depending on the version

– Asten Mies
Nov 25 '18 at 13:47

Tried, and still the same authentication failed

– Ed Prince
Nov 25 '18 at 13:53

@EdPrince if you guarantee that your async wrapper works then the only remaining difference is the trailing slash at the end of your mongoUrl. For the rest I can’t help any further sorry

– Asten Mies
Nov 25 '18 at 14:02

So it turns out you have to add the db name to the end of the URI, I hadn't realised that

– Ed Prince
Nov 25 '18 at 14:03

add a comment |

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Failing to connect to MongoDB hosted on mlab

Background

The Problem

The Code

What I Have Tried

Async Wrapper

Background

The Problem

The Code

What I Have Tried

Async Wrapper

Background

The Problem

The Code

What I Have Tried

Async Wrapper

Background

The Problem

The Code

What I Have Tried

Async Wrapper

1 Answer
1

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