NodeJS 14: Using a SSL CA Bundle

Question

I'm currently trying to use a CA Bundle with NodeJS 14.0. I've been using Namecheap's article as a guide the implement this feature. I'm currently stuck on a few things:

1. For the ca parameter for https.createServer(), what file formats are allowed to be passed in?
2. How do I check that a CA bundle is actually being used?

Answer 1

For the ca parameter for https.createServer(), what file formats are allowed to be passed in?

From NodeJS tls.createSecureContext:

Any string or Buffer can contain multiple PEM CAs concatenated together

Though, in general NodeJS uses PEM format.

How do I check that a CA bundle is actually being used?

You can use a certificate not signed by your CA, e.g. a self-signed certificate.