Shopify App Node Template POST request

I am trying to create a shopify app with node template , there i am making api in my express and fetching the api’s using useAuthenticatedfetch hook from the template itself ,but if i try to hit POST request using that authenticated fetch using POST headers and specify body in it , the body is sended in express backend,but while checking the request in chrome developer console network tab the payload is there ,if i log the body of the request in my express server the log is comming empty , how to solve this