I'm not really a GUI person nor do I use JS. I'm happy to see HTTP responses in textmode. I tried playing around with Postman and some other similar programs a while back in an attempt to understand how they could be superior to working with HTTP as text files. But I failed to see any advantage for what I need to do. One problem with GUIs/TUIs IMHO is that generally few people write them or modify them. And so users must look around to try to find one written by someone else that they like. Then they are stuck with it, and whatever "options" its author chooses to provide. Whereas with textmode programs, I can easily control all the aesthetics myself. Even when using other peoples' software, if there is something that annoys me, I can usually edit the source and change it.

Best of luck. Hope you can find the right program for viewing HTTP.