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It's fairly straight forward to get the hostname and URL from a request that has been made to an express server. But there seems to be no obvious way to determine which URL an express server is listening on (after it has been started up, but before any requests have been sent).
How do you find out which host and port an express server is listening on? Does express even know which host and port it is listening on?
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We can use the req. hostname property to get the hostname from a current incoming request in express. Example: const express = require("express"); const app = express(); app.
listen() function is used to bind and listen the connections on the specified host and port. This method is identical to Node's http. Server. listen() method.
I know that Express apps default to port 3000.
A small disadvantage is that, when generating the code, we do not know how to change some very basic things, for example, the port on which the app listens (the default port is 3000). In this post I will show you how to change the port in some app generated by express-generator.
If you create an server like this:
var server = http.createServer(app);
The server instance actually contains the port and address it's listening. So you could just export it, and call server.address() to get the address and port.
{ address: '::', family: 'IPv6', port: 3200 }
If you want further info about what urls are your routes are routing, try
console.log(router.stack)
then the magic happens. :)
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