Why am I getting blocked by CORS policy when I added a middleware to check the JWT token?

Why am I getting blocked by CORS policy when I added a middleware to check the JWT token, and how can I resolve this issue to ensure secure communication?

You're getting blocked by CORS policy because the server you're making requests to isn't allowing cross-origin requests from your origin. This is a security feature that prevents malicious websites from accessing resources on another domain.

To resolve this issue, you need to ensure that the server you're communicating with includes the appropriate CORS headers in its responses. Here are some steps to help you fix this:

Check Server Configuration: Ensure that the server you're making requests to is configured to allow cross-origin requests from your domain. This usually involves setting the Access-Control-Allow-Origin header in the server's response.

Update Middleware: If you're using middleware to handle CORS, make sure it's correctly configured to allow requests from your origin.

Set Headers in Client Requests: Ensure that your client-side code is correctly setting the necessary headers for CORS requests.

Set Headers in Client Requests: Ensure that your client-side code is correctly setting the necessary headers for CORS requests.