Tamper Data is a Firefox add-on to track and modify HTTP/HTTPS requests.
Is there a Google Chrome extension that can do the same?
Rahil Wazir's comment is correct but the right answer has sank to the bottom and was not well reasoned (perhaps back then it couldn't do this?)
you can easily capture requests made by web pages, tamper with the URL, headers and POST data
You can use RestEasy. Just put in all the headers, save the capture and then once you do that, you can modify the body to whatever data fits. I suggest using Inspect Element to retrieve the POST data. It is a one-way workaround, because technically, you can't edit http requests, but I found that you can fire your own.
Try using DevTools (Console Chrome Developer Tools) which are designed for that.
However it's probably not possible to modify HTTP requests in Chrome due to API restrictionsSO.
Some workarounds include:
or using proxies:
From API perspective, check