Express.js - guide with Cookie-Based Authentication on Subdomains
I've hit a wall trying to After trying multiple solutions online, I still can't figure this out. I'm currently working with a scenario with cookie-based authentication in my Express.js application when dealing with subdomains. I have a main application running on `example.com` and a subdomain for an API running on `api.example.com`. The scenario arises when I set a cookie in the main application, which I expect to be accessible from the subdomain. Here's how I set the cookie in my main application: ```javascript app.get('/login', (req, res) => { res.cookie('authToken', 'your_token_here', { httpOnly: true, secure: true, domain: '.example.com', // This should allow subdomains to access the cookie }); res.send('Logged in'); }); ``` However, when I try to make a request to the API at `api.example.com`, the cookie is not being sent along with the request. I confirmed this by checking the request headers in the browser's developer tools and seeing that `authToken` is missing. On the API side, I'm using the following code to retrieve the cookie: ```javascript app.get('/data', (req, res) => { const token = req.cookies.authToken; if (!token) { return res.status(401).send('Unauthorized'); } // Proceed with token verification... }); ``` I've tried the following steps to resolve the scenario: 1. Ensured that both applications are on HTTPS (as the secure cookie attribute requires it). 2. Verified that the cookie domain is set correctly. 3. Checked for any CORS-related issues, but I have configured the necessary headers to allow requests from `example.com` to `api.example.com`. Still, the cookie does not appear in requests to the API. Any ideas on what could be going wrong here? Is there something I'm missing about cookie handling across subdomains in Express.js? It seems straightforward, but I'm exploring on this. Using Express 4.17.1 and cookie-parser 1.4.5. My development environment is Windows. Any ideas what could be causing this? Thanks in advance! My team is using Javascript for this web app. I'd love to hear your thoughts on this. This issue appeared after updating to Javascript 3.10. Thanks for taking the time to read this!