[Error: failed to connect to [localhost:27017]] from NodeJS to mongodb

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

Does this answer your question? [Can't connect to MongoDB 6.0 Server locally using Nodejs driver](https://stackoverflow.com/questions/74609210/cant-connect-to-mongodb-6-0-server-locally-using-nodejs-driver) — Wernfried Domscheit, May 24 '23 at 05:48

score 22 · Answer 1 · answered Jul 12 '14 at 07:09

22

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?

answered Jul 12 '14 at 07:09

user2812866

589
1
5
15

YES! I used 127.0.0.1 in my apache config, which was previously localhost and it connected instantly. Thank you! – Andy Nov 27 '16 at 06:01

score 7 · Answer 2 · edited Oct 28 '14 at 17:41

7

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

edited Oct 28 '14 at 17:41

ani627

5,578
8
39
45

answered Oct 28 '14 at 17:31

Nicolás Sefercheoglou

87
1
1

This is exactly my problem. I commented "127.0.0.1 localhost" in my hosts file. – Nicolas S.Xu Jul 24 '17 at 19:19
Line `127.0.0.1 localhost` should exist in every `/etc/hosts` file by default. Unless you messed up your system, this answer is pointless. – Wernfried Domscheit May 24 '23 at 05:51

score 2 · Answer 3 · edited May 23 '17 at 12:34

2

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

edited May 23 '17 at 12:34

Community

1
1

answered Jul 13 '14 at 06:56

Chhavi Gangwal

1,166
9
13

This works, but then you can connect only from your local machine. This might be your intention or not. – Wernfried Domscheit May 24 '23 at 06:07

score 1 · Answer 4 · answered Jul 06 '17 at 09:37

1

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.

answered Jul 06 '17 at 09:37

yuanfang wang

51
4

It should be the other way around. Format of `/etc/hosts` file is `IPAddress Hostname Alias`. "the ip of my computer" is the (real) IP address, it should not be the alias. Typically you have `127.0.0.1 localhost` and ` ` – Wernfried Domscheit May 24 '23 at 06:13

score -1 · Answer 5 · answered Sep 02 '17 at 17:55

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)

[Error: failed to connect to [localhost:27017]] from NodeJS to mongodb

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