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that is my db.js from where i am exporting the function

 var mysql=require('mysql');

var config=

 host:'127.0.0.1',
 user:'root',
 password:'',
 database:'travel'

;
var con="";
var data=function getConnection() 

 con=mysql.createConnection(config);
 con.connect(function(err)
 
 if(err!=null)
 
 console.log('connection id: '+con.threadId);
 
 else
 
 console.log('connection error: '+err.stack);

 
 )
;
module.exports=data;

and here is my login.js file from where i am calling that exported data function

var express=require('express');
var db = require.main.require('./model/db');
var router=express.Router();

//routes
router.post('/',function(req,res)

 console.log(req.body);

);

router.get('/',function(req,res)

 data();
 res.render('login');
);

module.exports = router;

Here is the error message after running the code. can anyone please help me with that problem?

You should change the import statement as follows, because you are invoking the data() not db(). so you should change the import statement to data instead of db

var data = require.main.require('./model/db');

When you use module.exports you're specifying the object that is exported, not a name or set of names. Since you literally just export the data function you want to use, the line var db = require.main.require('./model/db'); first creates/finds that function and then assigns it to the variable db -- the original name doesn't matter at all.

Possible solutions to that problem (as indicated in the other answers) include replacing data() with db() or replacing var db with var data.