[Error: failed to connect to [localhost:27017]] from NodeJS to mongodb - node.js

Question

I am having problem connecting to MongoDB from NodeJS using following sample code. I tried running "mongod" with or without sudo but nodejs code still fail to connect. I am able to successfully connect to database using "mongo".
Running on : MAC OS 10.6.8
var mongoClient = require('mongodb').MongoClient;
mongoClient.connect("mongodb://localhost:27017/test", function(error, db) {
if(!error){
console.log("We are connected");
}
else
console.dir(error);
});
get following error running above code : [Error: failed to connect to [localhost:27017]]
Also tried mongoose but similar error:
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/test');
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function callback () {
console.log("DB connected");
// yay!
});
Output: connection error: [Error: failed to connect to [localhost:27017]]
Here is the log of mongod
mongod --help for help and startup options
2014-07-11T23:33:47.843-0700 kern.sched unavailable
2014-07-11T23:33:47.849-0700 [initandlisten] MongoDB starting : pid=29942 port=27017 dbpath=/data/db 64-bit host=usc8bcc8a0d0b1
2014-07-11T23:33:47.849-0700 [initandlisten]
2014-07-11T23:33:47.849-0700 [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
2014-07-11T23:33:47.849-0700 [initandlisten] db version v2.6.3
2014-07-11T23:33:47.849-0700 [initandlisten] git version: nogitversion
2014-07-11T23:33:47.849-0700 [initandlisten] build info: Darwin usc8bcc8a0d0b1 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386 BOOST_LIB_VERSION=1_49
2014-07-11T23:33:47.849-0700 [initandlisten] allocator: system
2014-07-11T23:33:47.849-0700 [initandlisten] options: {}
2014-07-11T23:33:47.850-0700 [initandlisten] journal dir=/data/db/journal
2014-07-11T23:33:47.850-0700 [initandlisten] recover : no journal files present, no recovery needed
2014-07-11T23:33:47.901-0700 [initandlisten] waiting for connections on port 27017
2014-07-11T23:34:47.901-0700 [clientcursormon] mem (MB) res:48 virt:2810
2014-07-11T23:34:47.901-0700 [clientcursormon] mapped (incl journal view):320
2014-07-11T23:34:47.901-0700 [clientcursormon] connections:0

Answer 1

Never mind, I was able to resolve the issue by using 127.0.0.1 instead of localhost, not sure why I have to use ip address. My tomcat, apache, redis, and even node server all works using localhost but not the mongodb. Is there is config I need change to make it work using local host?

Answer 2

Try adding 127.0.0.1 localhost in /private/etc/hosts file.

Answer 3

This issue can occur if your mongoDBwasnot shutdown properly
Mongodb can't connect to localhost but can connect to localhost's IP address
Start your mongoDB Server using follwoingcommand and then try same ./mongod --bind_ip localhost

Answer 4

yes , I came across this error too, and my hosts is as follow:
127.0.0.1 xxxxxx(the ip of my computer)
and when I ran npm start in express project, it got an error like that . After I tried to change the mapping of 127.0.0.1 to localhost, it had no error.

Answer 5

The first time, I made the obvious mistake that mongod (the mongo Server) was not even running.
The second time, I had both the Server (mongod) and the Client (mongo) running on my Windows; in separate Command Prompts (of course mongo running first). mongod and/or its Command Prompt was "hung up" (i.e. the last line only said this, and the last line remained like this despite attempts to connections:)
2017-06-20T12:31:02.937-0600 I NETWORK [thread1] waiting for connections on port 27017
I clicked in the Command Prompt pressed the space-bar to "kick it" , and the Command Prompt printed lines like these:
2017-06-20T12:31:48.517-0600 I NETWORK [thread1] connection accepted from 127.0.0.1:50260 #1 (1 connection now open)
Which worked!

Answer 6

Somebody on Github found a solution:
Instead of writing:
Mongoose.connect(config.database.url);
Write:
Mongoose.connect(config.database.url, {
keepAlive: true,
reconnectTries: Number.MAX_VALUE,
useMongoClient: true
});
(Source https://github.com/Automattic/mongoose/issues/5399)