mojolicious: access to a json attribute from a json post request

gistfile1.pl

package myProject::Webservice;

use Mojo::Base 'Mojolicious::Controller';
use constant true => 1;
use constant false => 0;

sub userLogin {
  my $self = shift;
  my $data = $self->req->json;


  #REQUEST: 
  #--------------------------------------------
  #Accept:application/json, text/javascript, */*; q=0.01
  #Accept-Encoding:gzip, deflate
  #Accept-Language:en-US,en;q=0.8,fr-FR;q=0.6,fr;q=0.4
  #Connection:keep-alive
  #Content-Length:37
  #Content-Type:application/json
  #Cookie: SESSION=eyJleHBpcmVzIjoxNDE5NjY4Mjg3LCJjc3JmX3Rva2VuIjoiZDM1MDZjNmU1MmFjMDFlNTc2YjU2ZGRmMjk3ODExMmE4ZTBhNTVjZCJ9--60a01b0bb1ec552d8d6248716a2f6034481a3abc
  #Host:192.168.56.101:3000
  #Origin:http://192.168.56.101:3000
  #Referer:http://192.168.56.101:3000/login.html
  #User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36
  #X-Requested-With:XMLHttpRequest

  #{"username":"test","password":"test"}
  #--------------------------------------------

  # log: [error] Bareword "username" not allowed while "strict subs" in use
  $self->app->log->info($data.username);

  # log: [error] Bareword "username" not allowed while "strict subs" in use
  $self->app->log->info($data => username);

  # log: HASH(0x21b78c8), except json string like when render below
  $self->app->log->info($data);
  
  # output nice json {"password":"test","username":"test"}
  $self->render( json => $data );

  return true;

}

1;

thanks to irc #mojo

Good answer is :

$self->app->log->info($data->{username});