How about something like:
c:\@Work\Perl\monks\henzen>perl -wMstrict -MData::Dump -le
"use JSON;
;;
my $json = q{
{
\"method\": \"xxx\",
\"backend\": {
\"client\": \"mytest009\",
\"pw\": \"sdkjfhsfjhKJH87\"
},
\"blah\": \"123\"
}};
my $data = decode_json($json);
dd $data;
;;
my %valid = map { $_ => 1 } qw(method backend);
my @invalid = grep { ! exists $valid{$_} } keys %$data;
die qq{invalid keys(s) present: @invalid} if @invalid;
"
{
backend => { client => "mytest009", pw => "sdkjfhsfjhKJH87" },
blah => 123,
method => "xxx",
}
invalid keys(s) present: blah at -e line 1.
Of course, you have to know all the valid keys in advance, and it's only a top-level check, but maybe a starting point.
Give a man a fish: <%-{-{-{-<
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