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Re: Getting error while decoding JSON object via POST method

by tobyink (Abbot)
on Feb 06, 2013 at 09:48 UTC ( #1017369=note: print w/ replies, xml ) Need Help??


in reply to Getting error while decoding JSON object via POST method

Here is an example of a CGI script that accepts JSON via HTTP POST, reads two numbers "a" and "b" from the input, and adds them together returning "c", plus an example client that uses the script...

#!/usr/bin/env perl use strict; use warnings; use CGI (); use JSON (); my $q = CGI->new; my $json = JSON->new->utf8; my $input = $json->decode( $q->param('POSTDATA') ); my $a = $input->{a}; my $b = $input->{b}; my $c = $a + $b; print $q->header("application/json"); print $json->encode({ c => $c });
#!/usr/bin/env perl use strict; use warnings; use JSON (); use LWP::UserAgent (); use HTTP::Request::Common qw( POST ); my $data = { a => 40, b => 2 }; my $json = JSON->new->utf8; my $ua = LWP::UserAgent->new; my $req = POST( "http://buzzword.org.uk/2013/json-addition.cgi", Content_Type => 'application/json', Content => $json->encode($data), ); my $result = $json->decode( $ua->request($req)->decoded_content ); print $result->{c}, "\n";
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name


Comment on Re: Getting error while decoding JSON object via POST method
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Re^2: Getting error while decoding JSON object via POST method
by perlCrazy (Monk) on Feb 06, 2013 at 10:26 UTC
    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"; }
    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 });
    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
      And the reason you don't DUMP the data is because?
        which data ?
        just dumped the data server side and loos like :
        {"a":40,"b":2={"a":40,&#034
        it is broken.

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