Node.js script not getting connected to Mongodb database in localhost - node.js

Question

I have following test code to run mongodb along with node.js while creating rest api
MONGO.JS
var mongoose = require("mongoose");
mongoose.connect('mongodb://localhost/smartRideDb');
// create instance of Schema
var mongoSchema = mongoose.Schema;
// create schema
var userSchema = {
"id" : String,
"email" : String,
"password" : String
};
// create model if not exists.
module.exports = mongoose.model('user',userSchema);
index.js is defined as
var mongoOp = require("./models/mongo");
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var router = express.Router();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({"extended" : false}));
app.use('/' , router);
var port = process.env.PORT || 3000;
/**
*
*
*
*/
// Generic error handler used by all endpoints.
function handleError(res, reason, message, code)
{
console.log("ERROR: " + reason);
res.status(code || 500).json({"error": message});
}
/**
*
*
*
*/
router.get("/",function(req,res)
{
res.json({"error" : false,"message" : "Hello World"});
});
//route() will allow you to use same path for different HTTP operation.
//So if you have same URL but with different HTTP OP such as POST,GET etc
//Then use route() to remove redundant code.
router.route("/users").get(function(req, res)
{
var response = {};
mongoOp.find({},function(err,data)
{
if(err)
{
response = {"error" : true,"message" : "Error fetching data"};
}
else
{
response = {"error" : false,"message" : data};
}
res.json(response);
});
});
app.listen(port);
console.log("Listening to PORT " + port);
When i run i get this error
Muhammads-MBP:Api Umar$ node index.js
Listening to PORT 3000
/Users/Umar/Desktop/Projects On List Data/Creative Studios/School Ride/Api/node_modules/mongodb/lib/server.js:242
process.nextTick(function() { throw err; })
^
Error: connect ECONNREFUSED 127.0.0.1:27017
at Object.exports._errnoException (util.js:890:11)
at exports._exceptionWithHostPort (util.js:913:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1057:14)
Why is mongodb not gett

Answer 1

You may want to try to ensure the MongoDB has properly setup first by following
MongoDB is installed successfully (OSX guide here)
Run mongod in terminal after installed to run the MongoDB
Run mongo in another terminal, and you should be able to see something similar.
.
MongoDB shell version: 3.2.4
connecting to: test

Answer 2

Try calling the connection to mongo before app.listen, mongoose open a pool of connections by default for attend the requests
mongoose.connect('mongodb://localhost/dbname', function(err) {
if (err) throw err;
app.listen(port);
console.log("Listening to PORT " + port);
});

Answer 3

Most common troubleshooting steps:
Configured localhost incorrectly somewhere, so try changing your connection string to mongodb://localhost:27017/smartRideDb.
Check if mongod is running at that port.
Check if some other process is using that port.