Sharing server object in expressJS with another file through module.exports

Question

Sharing server object in expressJS with another file through module.exports

As I work on my expressJS app, I encountered a situation where I needed to share the server object with another file. To achieve this, I decided to create the server in my app.js file and then expose it to one of my routes.

var server = http.createServer(app).listen(4021, function () {

    var port = server.address().port;

    console.log('http://localhost:%d', port);
});

module.exports = server;

Within the app.js file, I confirmed that the variable holds an object containing relevant server data. However, when attempting to access this variable from my routes.js file using require, I found that it was empty.

var server = require('../../server');

I am puzzled by this issue and would appreciate any insights into what might be going wrong.

javascript express require

Answer 1

Answer №1

Dealing with circular dependencies, such as the one you've described, can present challenges when it comes to implementation and debugging. While this may not directly address your query, if obtaining the port number is your main objective within the route, consider opting for a more straightforward solution. For instance, using middleware that appends the port number to the request object for easy access:

app.use(function(req, res, next) {
  req.port = 4021;
  next();
});

For additional insights, you might find this related SO discussion helpful: Expose vs Creating object in Router file of Nodejs. Although similar, adapting it to fit your scenario proved challenging.

Answer 2

Dealing with circular dependencies, such as the one you've described, can present challenges when it comes to implementation and debugging. While this may not directly address your query, if obtaining the port number is your main objective within the route, consider opting for a more straightforward solution. For instance, using middleware that appends the port number to the request object for easy access:

app.use(function(req, res, next) {
  req.port = 4021;
  next();
});

For additional insights, you might find this related SO discussion helpful: Expose vs Creating object in Router file of Nodejs. Although similar, adapting it to fit your scenario proved challenging.

Sharing server object in expressJS with another file through module.exports

Answer №1

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