perl のアウトプットを JSON フォーマットで

perl で JSON データを出力するメモ。

perl モジュール JSON を使用。

#!/usr/bin/perl

use strict;
use warnings;

use JSON;

    my @h_arr;
    my @array = ( 'a', 'b', 'c' );
    my $hash1 = { 'a' => '1', 'b' => '2', 'c' => '3' };
    my $hash2 = { 'a' => [@array], 'b' => [@array], 'c' => 3 };
    my $hash3 = { 'a' => $hash1 };

    for ( 1..3 ) {

        push( @harr, [@arr] );

    }

    &json( '$hash1', $hash1 );
    &json( '$hash2', $hash2 );
    &json( '$hash3', $hash3 );
    
    &json( '@array', \@array );
    &json( '@_harr', \@h_arr );

sub json {

    my $data = shift;
    my $json;

    $json = to_json($data, { utf8 => 1});

    print "$json\n";

    return;

}

exit;

これを実行するとこんな感じ。

 $hash1 = {"c":"3","a":"1","b":"2"}
 $hash2 = {"c":3,"a":["a","b","c"],"b":["a","b","c"]}
 $hash3 = {"a":{"c":"3","a":"1","b":"2"}}
 @array = ["a","b","c"]
 @_harr = [["a","b","c"],["a","b","c"],["a","b","c"]]

簡単にデータを JSON データに変換できるので便利。