AkelPad

for modern development, XML,Javascript, JSON are popular tools,
so when we get a file, or copy it from network , we need
a formatter for pretty validate it.

powerpcer
Did you searched? For example, I remembered: XML: XMLValidator.js, with HTML Tidy (valid./format.), XMLStarlet (valid./format.), jsBeautifier.js (format.); JavaScript: jsBeautifier.js
I think it's not all...

And you can add other command line utils (or can ask to help).

powerpcer wrote:or copy it from network

And/or you can use
https://www.google.com/search?q=xml+format+online
https://www.google.com/search?q=javascr ... mat+online
https://www.google.com/search?q=json+format+online