Practical REST API

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The document discusses replacing the use of admin-ajax.php in WordPress with the REST API. Admin-ajax.php is inefficient, not cached, lacks authentication and validation infrastructure, and results in ad hoc messy code. WordPress introduced core REST API support in version 4.4, and the REST API plugin adds built-in endpoints. Examples show converting an admin-ajax.php implementation to use the REST API instead, which is recommended as it is faster, cleaner, easy to implement and migrate to compared to admin-ajax.php.

Practical REST API
Why admin-ajax.php should be avoided and how
Aki Björklund
CTO,H1
@akibjorklund

Communication between JavaScript and PHP
is done with Ajax

Historically that is done in WordPress by
calling 
/wp-admin/admin-ajax.php

3.
No infrastructure like authentication, data
validation, …

In many cases no need to write any PHP to
do a lot.

But what can you do just with
what the core already has?

Best practice is to implement what you
just saw as a REST Controller. Currently
available only with the REST API plugin.

Use the REST API instead of
admin-ajax.php

It’s also both easy to implement
and migrate to

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