Send Browser Timestamp with JSON API call

Hi Grafana community,
Hope you are all well, I need help to call JSON API, I have a nodeJS Project wich returns data.
I have to send browser timestamp to call the API’s. But i have no Idea ho to get browser Time stamp and bind with api calling. I tried jsonata method $now() but i have no idea how to add in Path any good fellow who have any idea ho to send it with calling the API Please share here Thanks.