It's hassle free, does not require installing any software and is speedy and secure.
Simply paste your JSON snippet into the text box. Your JSON will automatically be formatted and displayed in a tree-view on the right hand side. If the JSON is invalid, an error will be displayed indicating the line where the error occurred and the reason for it's occurence. You can also copy your formatted JSON by clicking the copy button.
Absolutely not! Your data is merely processed and returned directly to you, it is not saved in any capacity.