document updated 13 years ago, on Nov 3, 2011

Modules that are useful for debugging:

MAXIMUM — things to use if you want to do your best to catch ALL error information
Data::Dumper — The queen of [log-style] debugging tools. Everyone needs to know how to use this.
- Data::Dump::Streamer — Even better. In particular, it can dump anonymous subroutines with full lexical context (ie. closures).
- Dumpvalue — the code behind the Perl debugger's 'x' command
Devel::Comments — easier alternative to un/recommenting debugging statements as you go
- Smart::Comments — an older/unmaintained version of Devel::Comments
change to manual-debugger-mode if an error is hit
- Carp::REPL
- the standard debugger can do the same thing: 1) start in noTTY mode, 2) when the program wants to break, set $DB::signal or $DB::single
debugging CGI scripts
- use CGI::Carp qw(fatalsToBrowser);
- CGI::Inspect
- Plack::Middleware::StackTrace
a bunch of different 'trace' modules
several full-fledged debuggers