Where is node's certificate store?

It seems that while there is no store, but there is a default list of CA's built into the source.

My search ultimately led me to the closest thing to a store, this file of CA's that node.js supports:

https://github.com/joyent/node/blob/master/src/node_root_certs.h

Thus, while it is true that it doesn't do a lookup on the system hosted CA's and that there is no "store" per se, there is a default list of CA's that it accepts.

As mentioned by @Joe and @damphat, you can add your own with the Agent.options.ca property, unfortunately that workaround isn't practical in my case.

There is not a store. You can pass a ca option to the https request to tell it what CAs you do trust.

From the docs:

The following options from tls.connect() can also be specified. However, a globalAgent silently ignores these.

• ca: An authority certificate or array of authority certificates to check the remote host against.

In order to specify these options, use a custom Agent.

var options = {
  ...
  ca: CA or [array of CAs]
  ...
};

options.agent = new https.Agent(options);

var req = https.request(options, function(res) {

Ref: http://nodejs.org/api/https.html#https_https_request_options_callback