Nonce in WordPress

In WordPress, a nonce (which stands for “number used once”) is a unique identifier that is generated to help protect against certain types of security threats, such as cross-site request forgery (CSRF) attacks.

A nonce is typically a randomly generated string of characters that is added to a form or URL, and it is checked by the server when the form is submitted or the URL is accessed to ensure that the request is valid and has not been tampered with.

WordPress uses nonces in a variety of ways, such as to verify that a user is authorized to perform a particular action (e.g. editing a post), to prevent duplicate form submissions, and to protect against CSRF attacks. Nonces are an important security measure in WordPress and are used throughout the core code as well as in plugins and themes.