title: Are WordPress REST API and WP JSON API different?
body: <p>I'm trying to code the user authentication feature for my app using API. I'm confused between <a href="https://developer.wordpress.org/rest-api/" rel="nofollow noreferrer">WordPress REST API</a> and <a href="https://wordpress.org/plugins/json-api/" rel="nofollow noreferrer">WordPress JSON API</a>? Based on the <a href="https://stackoverflow.com/questions/13679001/register-login-user-with-wordpress-json-api">Q&amp;A here</a>, it says I need WordPress JSON API. If my WP already has REST API, do I still need this JSON API?</p>