How do I encode a simple array into JSON in Perl?

Question

All the examples that I've seen of encoding objects to JSON strings in Perl have involved hashes. How do I encode a simple array to a JSON string?

use strict;
use warnings;
use JSON;
my @arr = ("this", "is", "my", "array");
my $json_str = encode_json(@arr);  # This doesn't work, produced "arrayref expected"

# $json_str should be ["this", "is", "my", "array"]

"This doesn't work" isn't a useful description of your problem. Please explain carefully what happens, and how it differs from what you require. — Borodin
– Borodin, Commented Mar 20, 2014 at 1:10

Miller · Accepted Answer · 2014-03-20 01:02:42Z

30

If you run that code, you should get the following error:

hash- or arrayref expected (not a simple scalar, use allow_nonref to allow this)

You simply need to pass a reference to your \@arr

use strict;
use warnings;

use JSON;

my @arr = ("this", "is", "my", "array");
my $json_str = encode_json(\@arr);  # This will work now

print "$json_str";

Outputs

["this","is","my","array"]

answered Mar 20, 2014 at 1:02

Miller

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