var mysql = require('mysql');
 var con = mysql.createConnection({
 host: "localhost",
user: "root",
password: "",
 database:"nodedb"
});
con.connect(function(err) {
if (err) throw err;
console.log("Connected!");
});

if (err) throw err;
       ^

Error: connect ECONNREFUSED 127.0.0.1:3306
at Object.exports._errnoException (util.js:870:11)
at exports._exceptionWithHostPort (util.js:893:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1063:14)
--------------------
at Protocol._enqueue (/home/mega/Projects/nodejs/node_modules/mysql/lib/protocol/Protocol.js:141:48)
at Protocol.handshake (/home/mega/Projects/nodejs/node_modules/mysql/lib/protocol/Protocol.js:52:41)
at Connection.connect (/home/mega/Projects/nodejs/node_modules/mysql/lib/Connection.js:130:18)
at Object.<anonymous> (/home/mega/Projects/nodejs/myapp/db.js:11:5)
at Module._compile (module.js:410:26)
at Object.Module._extensions..js (module.js:417:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
at Function.Module.runMain (module.js:442:10)
at startup (node.js:136:18)