How to implement Google reCaptcha without installing a plugin?


WordPress noob here wondering how to include reCaptcha authentication in my login without a plugin?

So far I have added the captcha div into the login using a hook:

  function my_added_login_field(){
        <div class="g-recaptcha" data-sitekey="mySiteKey"></div>

The script is enqueued. Now I just need to add an authentication process to verify the captcha before loggin the user in. I know I need to use something like this filter:

add_filter( 'authenticate', 'my_custom_authenticate', 10, 3 );
function my_custom_authenticate( $user, $username, $password ){

$my_value = $_POST['g-captcha-response'];

if (!)

return $user;

But I’m a little stuck. According to google once the captcha is solved a field named “g-captcha-response” is populated and the response in a JSON object:

  "success": true|false,   
  "challenge_ts": timestamp,  // timestamp of the challenge load (ISO format yyyy-MM-dd'T'HH:mm:ssZZ)
  "hostname": string,         // the hostname of the site where the reCAPTCHA was solved
  "error-codes": [...]        // optional

I’m just a noob so I have no idea what to do with that info. Any help is appreciated!

James Hamann 4 months 0 Answers 13 views 0

Leave an answer