$ ./1.marshall.pl 
JSON error at line 110, byte 2639/2647: Unexpected character '_' parsing initial state: expecting whitespace: 'n', '\r', '\t', ' ' at ./1.marshall.pl line 8, <DATA> line 1.
$ cat 1.marshall.pl 
#!/usr/bin/perl -w
use 5.016;
use JSON::Parse 'parse_json';


my $json = do{local $/ = undef;<DATA>};

my $out = parse_json $json;
my %xlated_abbrev;  #simple abbreviation table => description

foreach my $key (keys %{$out->{icons}}) #gen simple xlate table
{
   $xlated_abbrev{$key} = $out->{icons}{$key}{description};
}

my @urls = (
'https://api.weather.gov/icons/land/day/tsra_sct,20/tsra_sct,40?size=medium',
'https://api.weather.gov/icons/land/day/rain_showers,30/tsra_hi,30?size=medium',
'https://api.weather.gov/icons/land/night/rain_showers,30/rain_showers?size=medium',
'https://api.weather.gov/icons/land/day/bkn?size=medium'
);

foreach my $url (@urls)
{
   my $last_path = (split('/',$url))[-1];
   my ($abbrev_to_xlate) = $last_path =~ /^(\w+)/;

   print "URL = $url\n";
   print "   $abbrev_to_xlate => \'$xlated_abbrev{$abbrev_to_xlate}\'\n\n";
}



__DATA__
{
    "@context": [],
    "icons": {
        "skc": {
            "description": "Fair/clear"
        },
        "few": {
            "description": "A few clouds"
        },
        "sct": {
            "description": "Partly cloudy"
        },
        "bkn": {
            "description": "Mostly cloudy"
        },
        "ovc": {
            "description": "Overcast"
        },
        "wind_skc": {
            "description": "Fair/clear and windy"
        },
        "wind_few": {
            "description": "A few clouds and windy"
        },
        "wind_sct": {
            "description": "Partly cloudy and windy"
        },
        "wind_bkn": {
            "description": "Mostly cloudy and windy"
        },
        "wind_ovc": {
            "description": "Overcast and windy"
        },
        "snow": {
            "description": "Snow"
        },
        "rain_snow": {
            "description": "Rain/snow"
        },
        "rain_sleet": {
            "description": "Rain/sleet"
        },
        "snow_sleet": {
            "description": "Rain/sleet"
        },
        "fzra": {
            "description": "Freezing rain"
        },
        "rain_fzra": {
            "description": "Rain/freezing rain"
        },
        "snow_fzra": {
            "description": "Freezing rain/snow"
        },
        "sleet": {
            "description": "Sleet"
        },
        "rain": {
            "description": "Rain"
        },
        "rain_showers": {
            "description": "Rain showers (high cloud cover)"
        },
        "rain_showers_hi": {
            "description": "Rain showers (low cloud cover)"
        },
        "tsra": {
            "description": "Thunderstorm (high cloud cover)"
        },
        "tsra_sct": {
            "description": "Thunderstorm (medium cloud cover)"
        },
        "tsra_hi": {
            "description": "Thunderstorm (low cloud cover)"
        },
        "tornado": {
            "description": "Tornado"
        },
        "hurricane": {
            "description": "Hurricane conditions"
        },
        "tropical_storm": {
            "description": "Tropical storm conditions"
        },
        "dust": {
            "description": "Dust"
        },
        "smoke": {
            "description": "Smoke"
        },
        "haze": {
            "description": "Haze"
        },
        "hot": {
            "description": "Hot"
        },
        "cold": {
            "description": "Cold"
        },
        "blizzard": {
            "description": "Blizzard"
        },
        "fog": {
            "description": "Fog/mist"
        }
    }
}


__END__ 
$