JSON not loading Cpanel::JSON::XS

1nickt has asked for the wisdom of the Perl Monks concerning the following question:

Hi all,

My understanding is that using JSON will cause Perl to load JSON::XS or Cpanel::JSON::XS if they are installed. But my testing shows that JSON::PP is used:

$ perl -MJSON -e 1

$ perl -MJSON::XS -e 1
Can't locate JSON/XS.pm in @INC (you may need to install the JSON::XS 
+module) [...]
BEGIN failed--compilation aborted.

$ perl -MCpanel::JSON::XS -e 1

$ perl -MJSON -MData::Dumper -wE 'decode_json(qq{{"foo":"bar"}}); say 
+Dumper %INC;' | grep JSON
$VAR33 = 'JSON/PP.pm';
$VAR34 = '/Users/ntonkin/perl5/perlbrew/perls/perl-5.26.1/lib/5.26.1/J
+SON/PP.pm';
$VAR37 = 'JSON.pm';
$VAR38 = '/Users/ntonkin/.perlbrew/libs/perl-5.26.1@dev/lib/perl5/JSON
+.pm';
[download]

Anything I have missed?

The way forward always starts with a minimal test.

Comment on JSON not loading Cpanel::JSON::XS Download Code

Replies are listed 'Best First'.
Re: JSON not loading Cpanel::JSON::XS by dasgar (Priest) on Apr 16, 2018 at 15:52 UTC
If you have Cpanel::JSON::XS installed and want JSON to use that module, you might want to look at the Choosing Backend section of JSON's documentation, which provides instructions on how to specify a backend module to use.	[reply]
Re^2: JSON not loading Cpanel::JSON::XS by 1nickt (Canon) on Apr 16, 2018 at 16:01 UTC
Awesome, thanks! RTFM, I guess! So JSON will automatically load JSON::XS if installed, but you have to specify Cpanel::JSON::XS if you want it with `PERL_JSON_BACKEND=Cpanel::JSON::XS` ... The way forward always starts with a minimal test.	[reply] [d/l]
Re: JSON not loading Cpanel::JSON::XS by Haarg (Priest) on Apr 17, 2018 at 10:04 UTC
JSON::MaybeXS was created to address this exact issue. It will try to use Cpanel::JSON::XS, then JSON::XS, then JSON::PP.	[reply]
Re^2: JSON not loading Cpanel::JSON::XS by 1nickt (Canon) on Apr 17, 2018 at 13:25 UTC
Thanks Haarg! I was pretty sure one could leave it up to the module; just didn't remember which module! The way forward always starts with a minimal test.	[reply]

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