I've made internal tools for the exact thing, jwt inspection , which was a nice exercise and guarantees privacy. For things like JSON, using your editor/cli would be much faster. I'm not sure why a lot of developers don't add these integrations/learn the tools.
Because many users would rather not learn how to use 12 different cli commands. Many software dev can't even be bothered to learn how to copy/paste text content in the terminal or vim that spans longer than the screen.
A Web page makes things simpler, everyone has a browser. I built an internal web tool, replicated what the ones found on the Internet do, and developers in my organisation are using it daily.
