[Mostly online] tools that unminify / reformat / beautify code

• Javascript — to undo the effect of minifying/compacting tools
  • unminify.com
  • (more)
• HTML
  • unminify.com
  • beautifytools.com/html-beautifier.php
• CSS
  • unminify.com
• JSON
  • unminify.com
• Perl
  • tutorialspoint.com/online_perl_formatter.htm