thanks for response, still getting same error. i tried code : cleint :

use strict;
use warnings;
use JSON ();
use LWP::UserAgent ();
use HTTP::Request::Common qw( POST );
use Data::Dumper;

my $data = { a => 40, b => 2 };

my $json = JSON->new->utf8->allow_nonref;
my $ua   = LWP::UserAgent->new;

my $req = POST(
    "$my_url",
    Content_Type => 'application/json',
    Content      => $json->encode($data),
);
my $response = $ua->request($req);
if ($response->is_success) {
    #print Dumper($response->content());
    my $perlData = $json->decode($response->content());
    print Dumper($perlData);
}
else{
    print " inside falied block\n";
}
[download]

server side:

#use cgi.pm to get json as input
    my $q = CGI->new;
    my $json  = JSON->new->utf8;
    my $input = $json->decode( $q->param('POSTDATA') );
    #my $input = $q->param('POSTDATA');

    my $a = $input->{'a'};
    my $b = $input->{'b'};
    my $c = $a + $b;
    print $q->header("application/json");
    #print Dumper($input);
    print $json->encode({ c => $c });
[download]

output of run : ./test_client.pl $VAR1 = { 'error_msg' => 'Failed during execution: malformed JSON string, neither array, object, number, string or atom, at character offset 0 (before "(end of string)") ', 'status_code' => 500 }; Thanks

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.