node check if running on localhost?

To check if a Node.js application is running on localhost, you can use the following code:

const isLocalhost = req.hostname === 'localhost';

Explanation: 1. We declare a variable isLocalhost to store the result of the comparison. 2. We use the req.hostname to retrieve the hostname from the request object. 3. We compare the req.hostname with the string 'localhost' using the strict equality operator ===. 4. If the req.hostname is equal to 'localhost', the variable isLocalhost will be true; otherwise, it will be false.