Connection Error (err) - Mongodb connection using nodejs in an expressjs framework

Question

Im training right now in nodejs and how to develop MVC applications using nodejs and expressjs as a framework. I have a TDD approach along with the Model and View classes written along with TDD test scripts. I have a mongodb test script and it fails with the the following error message:

expressjs_multech_project mul$ jasmine-node ./tests
.......F

Failures:

  1) MongoDB is there a server running?
   Message:
     Expected {  } to be null.
   Stacktrace:
     Error: Expected {  } to be null.
    at /Users/.../expressjs_multech_project/tests/mongodb.spec.js:6:19
    at /Users/.../expressjs_multech_project/node_modules/mongodb/lib/mongodb/mongo_client.js:334:20
    at /Users/.../expressjs_multech_project/node_modules/mongodb/lib/mongodb/db.js:258:16
    at null.<anonymous> (/Users/.../expressjs_multech_project/node_modules/mongodb/lib/mongodb/connection/server.js:621:7)
    at emitThree (events.js:110:13)
    at emit (events.js:188:7)
    at null.<anonymous> (/Users/.../expressjs_multech_project/node_modules/mongodb/lib/mongodb/connection/connection_pool.js:139:15)
    at emitTwo (events.js:100:13)

Finished in 0.182 seconds
8 tests, 18 assertions, 1 failure, 0 skipped

Im using Jasmine for node as a test package and all other tests pass with just the model and view classes written. I don't understand why my mongodb TDD script fails on mongodb and when I npm start, it does not start returning the app.js error message of:

> node app.js

Sorry, the server (mongodb) is not running

I researched back the stack trace and from what I can see, there is no connection been made with mongodb and its returning null. I checked mongodb to make sure its there:

Johns-MacBook-Pro:expressjs_multech_project mul$ npm list mongodb
[email protected] /Users/.../expressjs_multech_project
└── [email protected]

I have tried allot of remedies but nothing to date is working. Any ideas on resolving the connection issue with the server so I can proceed with this expressjs MVC training project?

my config/index.js looks like this:

var config = {
    local: {
      mode: 'local',
      port: 3000,
      mongo: {
        host: '127.0.0.1',
        port: 27017
      }
    },
    staging: {
      mode: 'staging',
      port: 4000,
      mongo: {
        host: '127.0.0.1',
        port: 27017
      }
    },
    production: {
      mode: 'production',
      port: 5000,
      mongo: {
        host: '127.0.0.1',
        port: 27017
      }
    }
}
module.exports = function(mode) {
  //export module configuration making it available to all files in folder
  return config[mode || process.argv[2] || 'local'] || config.local;

Here is the ouputs I got when I augmented the package.json file and npm install mongodb --save to run the install mongo after npm install

muls-MacBook-Pro:expressjs_multech_project jmulhall$ npm install mongodb --save

> [email protected] install /Users/jmulhall/Documents/Web_Development/Express-Nodejs/expressjs_multech_project/node_modules/kerberos
> (node-gyp rebuild 2> builderror.log) || (exit 0)

  CXX(target) Release/obj.target/kerberos/lib/kerberos.o

> [email protected] install /Users/jmulhall/Documents/Web_Development/Express-Nodejs/expressjs_multech_project/node_modules/bson
> (node-gyp rebuild 2> builderror.log) || (exit 0)

  CXX(target) Release/obj.target/bson/ext/bson.o
[email protected] /Users/jmulhall/Documents/Web_Development/Express-Nodejs/expressjs_multech_project
├─┬ [email protected]
│ └─┬ [email protected]
│   └─┬ [email protected]
│     └─┬ [email protected]
│       └─┬ [email protected] 
│         └── [email protected] 
└─┬ [email protected] 
  ├─┬ [email protected] 
  │ └── [email protected] 
  ├── [email protected] 
  └─┬ [email protected] 
    └── [email protected]

Thanks...

Hi John It's not clear from the info if you have validated that your mongo server is up. Are you running mongodb locally or from a service provider? — Number 9
– Number 9, Commented Mar 21, 2016 at 17:03
9, I have ran npm start and its failed to launch, that is the basis of my validation of mongdb server validation. — John Mulhall
– John Mulhall, Commented Mar 21, 2016 at 17:16
Ok but the node library doesn't think mongo is up and running. When you run 'mongo' the command line client installed with mongodb what do you get? — Number 9
– Number 9, Commented Mar 21, 2016 at 17:20
9, I get nothing... nothing for mongd, mongodb or any other iteration you can think of with "mongo" in it — John Mulhall
– John Mulhall, Commented Mar 21, 2016 at 17:21

Number 9 · Accepted Answer · 2016-03-22 09:41:18Z

1

That doesn't look like an error from install as the components return exit 0 which is fine.

To be clear though the package you are installing is only the official mongodb driver https://www.npmjs.com/package/mongodb - The official MongoDB driver for Node.js. Provides a high-level API on top of mongodb-core that is meant for end users.

You need to install the mongodb server to have a full install https://docs.mongodb.org/manual/installation/

answered Mar 22, 2016 at 9:41

Number 9

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2 Comments

John Mulhall Over a year ago

Great stuff Number 9... I got it fixed.. but not after learning loads about mongodb and its installation. Im a brew fan but this time round the extras on brew seem to be causing more bad installs.

John Mulhall Over a year ago

I found a very clear installation blog article and followed it and its now working on my local machine (Mac OSX 10.11.4). I also ran the TDD tests again on my MVC app and its passed all tests including the mongodb test script I checked about a thousand times yesterday! The link to the blog/tutorial for manual installs is mkyong.com/mongodb/how-to-install-mongodb-on-mac-os-x ... I would say that I find nano easier then vim so I used nano to update my bash_profile. The manual installation worked a charm. Thank you sir for all your help and inputs... you are a king amongst men!!...

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