How to Disable the JSON REST API in WordPress

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First, you will need to connect to your server using your FTP credentials and navigate to the root WordPress directory, often called public_html.

Then, navigate to the /wp-content/themes directory and click on the directory of your currently active theme to open it. Locate the functions.php and add the following code:

function qode_disable_rest_api( $access ) {
return new WP_Error( 'rest_disabled', __( 'The WordPress REST API has been disabled.' ), array( 'status' => rest_authorization_required_code() ) );
}
add_filter( 'rest_authentication_errors', 'qode_disable_rest_api' );

After that, check whether everything works as it should by examining one of the JSON REST API routes that are present on your website.

website.com/wp-json

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