#+BEGIN_SRC js var school = { schoolName: "MIT" } console.log(school.hasOwnProperty("schoolName")) // true #+END_SRC The execution of the above codeblock produces error because of the comment at the end. I realised it when I opened the temporary file org-babel was using to execute the code. The temporary file had the following js code: require('sys').print(require('sys').inspect(function(){var school = { schoolName: "MIT" } console.log(school.hasOwnProperty("schoolName")) // true}())); And there were no errors for sure when I removed the comment. Hope the bug gets fixed. Emacs : GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9) of 2016-04-25 on lgw01-10, modified by Debian Package: Org mode version 9.0.1 (9.0.1-elpa @ /home/compro/.emacs.d/elpa/org-20161118/)