WordPress Core APIs

WordPress Core Application Programming Interface, commonly abbreviated as WordPress Core APIs is a collection of several individual APIs and each API covers the functions involved in adding a particular set of functionality to WordPress. Together, they provide an interface for WordPress developers to write plugins and themes which can interact with the core. ↔️

Using these APIs, you can leave the heavy lifting to WordPress’ Core and be assured that your code is backward-compatible and future-proof.

Now that you have understood what WordPress Core APIs are, you can have a look at the below APIs to understand how to extend the functionality offered by WordPress through plugins.

• Plugin API
• Settings API
• Options API
• Metadata API
• REST API
• HTTP API
  • GET with transient caching
  • GET with basic authentication
• Database API
• Transients API
• Shortcode API
• Rewrite API
  • Especially add_rewrite_endpoint().
• Dashboard Widgets API
• Widgets API
• Theme Modification API
• Filesystem API
• File Header API
• XML-RPC WordPress API