You are getting the following error message: 

Usage: JSON::Parse::warn_only(parser, onoff)

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It indicates that you need to use the following syntax: 

my $jp = JSON::Parse->new();
JSON::Parse::warn_only($jp, 1);

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The above simplifies to the following: 

my $jp = JSON::Parse->new();
$jp->warn_only(1);

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To parse the JSON, you need to use that $jp object, so you can't parse_json. You need to use run instead. 

my $data = $jp->run($json);

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That's why warn_only is documented as a method that can be used to modify run.

In reply to Re: JSON::Parse how to warn_only()? by ikegami
in thread JSON::Parse how to warn_only()? by bliako

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