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I have a form I'm creating programmatically with a custom module, and I need to add the Google recaptcha to it. In the Google reCaptcha module's settings page (/admin/config/spam_protection/google_recaptcha/forms) I only see the login, register and comments forms and no way to add a custom form (like in the captcha module).

I googled as well as looked in the Google Captcha module's files and API file and can't find any hooks or info on how I can add the captcha element to a custom form. Any pointers would be appreciated!

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You can use recaptcha module (https://www.drupal.org/project/recaptcha) and in captcha settings(admin/config/people/captcha) you can add your custom form's form_id and select the challenge type reCAPTCHA(from module recaptcha). This should work.

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  • Interestingly, the captcha module doesn't work with the form_id if the custom form's function name is different. So if the custom function that creates the form is function foo_form() and the form id is set to bar_form inside the form function, I had to put foo_form in the captcha's settings.
    – longboardnode
    May 19 '17 at 3:27
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    For those coming here for Drupal 8, I've written a guide here to setting up Captcha for a form (specific focus in the instructions is for making use of the form id, which might not be obvious enough for some): drupal.org/project/captcha/issues/2736881#comment-13594561
    – therobyouknow
    May 3 '20 at 20:13

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