#+begin_src cfengine3
bundle agent main
{
  vars:
    "json_string" string => '{"test": [1, 2, 3]}';

  reports:
    "This JSON string is valid!"
      if => validjson("$(json_string)");
    "This JSON string is not valid."
      unless => validjson("$(json_string)");
}
#+end_src
###############################################################################
#+begin_src example_output
#@ ```
#@ R: This JSON string is valid!
#@ ```
#+end_src