I'm using org-mode in Spacemacs and have this code block:

#+BEGIN_SRC js :var payload=access-token-payload
let parsedPayload = JSON.parse(access-token-payload);
return parsedPayload.access_token;

Expected behavior: The code executes when I press C-c C-c

Actual behavior: I get an error saying No org-babel-execute function for js!. This should be supported since org-babel is present. I code a lot of Node and Javascript applications so Node is in my path.

1 Answer 1


You need to enable evaluation of js code. "Section 16.9" of org manual states:

By default, only 'emacs-lisp' is enabled for evaluation. To enable or disable other languages, customize the `org-babel-load-languages' variable either through the Emacs customization interface, or by adding code to the init file as shown next:

In this example, evaluation is disabled for 'emacs-lisp', and enabled for 'R'.

  '((emacs-lisp . nil)
    (R . t)))

The provided example is not totally clear IMHO but that works. Another way to enable a language is to require the org babel module for the language, eg here:

M-: (require 'ob-js)
  • This is strange because I was using bash, python and org code blocks without any issue, out of the box. Thanks.
    – Mario Gil
    Dec 17, 2019 at 19:35
  • I cannot find ob-js in melpa or melpa-stable. Where is ob-js being maintained?
    – ksinkar
    Sep 12, 2021 at 7:56
  • It is included in org! org-9.4.6.tar contains -rw-r--r-- elpa/elpa 7397 org-9.4.6/ob-js.el
    – JeanPierre
    Sep 16, 2021 at 7:16

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