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This line
my $json = new JSON(autoconv => 0); # <-- line X
raises this error
Usage: JSON::XS::new(klass) at (...) line X
What’s wrong?
It’s a follow up to my question Is there a way to force quotation of numbers in JSON 1.x Perl module?
The API for the JSON module changed substantially between 1.15 and 2.00. Code written for JSON 1.x won’t necessarily work with JSON 2.x. In particular, the 1.x constructor took optional parameters. The 2.x constructor takes no parameters; instead, you use mutator functions after construction.
If you must support both JSON 1.x and 2.x for some reason, you’ll need to check if
JSON->VERSION < 2(actuallyJSON->VERSION < 1.99if you count the development releases of the 2.x API) and have two versions of your code, one for the 1.x API and one for 2.x.