Question About Headless Front End - node.js, Vue, angular etc

With all the buzz now around headless e-eCommerce I was wondering if there's a way to pass a cart from a different front end and use zencart for the checkout part.

Basically the question is how we can create the cart session from the outside

There's always a way. Time, money, devotion probably are minimum things to have. Somewhat curious about what is conceived as "headless...", more of why would one need to basically do away with the capability of what is here... sure, don't have to be "stuck" with a product type's view or really any one aspect, but at some point the product has to pass by the store and get purchased... how much is gutted out? Again, really depends on what is needed, but the general design of ZC has not been just a payment processor...

I'm wondering if anyone figured a way to design a headless front end in js etc. Instead of using the conventional zencart templating system.

Being that ZenCart doesn't offer an API out of the box, it becomes a little more challenging however I do think it would be possible.

I was thinking of something like making use of Ajax calls etc.

The main challenge I see is implementing sessions.

Any guidance in this would be appreciated

If this is really what you want to do, Zen Cart might not be the right tool at this time. Have you looked at https://www.vendure.io/ ?