Mastering Flask Web Development - Second Edition

Protecting your form from spam

The registration form will have a username field, a password field with a confirmation field, and a special field named a reCAPTCHA field. A CAPTCHA is a special field on a web form that checks whether the person who is entering data into the form is actually a person, or an automated program that is spamming your site. The reCAPTCHA field is simply one implementation of a CAPTCHA field. The reCAPTCHA method has been integrated into WTForms, as it is the most popular implementation on the web.

To use reCAPTCHA, you will need a reCAPTCHA login from https://www.google.com/recaptcha/intro/index.html. As reCAPTCHA is a Google product, you can log in with your Google account.

Once you log in, it will ask you to add ...