Exporting functions/ objects in a NodeJS + Express route file

In general NodeJS router files looks like following, where we create router and add endpoints to it and export the router.

api.js

var express = require('express');
var router = express.Router();

router.get('/ping', (req, res) => {
    res.send('pong');
}));

module.exports = router;

and in the server.js or index.js file we wire it using the following code

index.js

var express = require('express');
var app = express();

app.use('/api', require('./api.js'));

But in some cases, we may want to return functions or objects from the same router file, we can achieve that using the following code.

api.js

var express = require('express');
var router = express.Router();


let barData = {
 a: 1,
 b: 2
}

function fooFunc(){

}

router.get('/ping', (req, res) => {
    res.send('pong');
}));

module.exports = {
    router,
    fooFunc,
    barData
};

index.js

var express = require('express');
var app = express();

app.use('/api', require('./api.js').router);


// using the data
console.log(require('./api.js').barData);

// using the functon
require('./api.js').fooFunc();