Does something like is_rest() exist

It’s a good point by @Milo, the REST_REQUEST constant is defined as true, within rest_api_loaded() if $GLOBALS['wp']->query_vars['rest_route'] is non-empty.

It’s hooked into parse_request via:

add_action( 'parse_request', 'rest_api_loaded' );

but parse_request fires later than init – See for example the Codex here.

There was a suggestion (by Daniel Bachhuber) in ticket #34373 regarding WP_Query::is_rest(), but it was postponed/cancelled.

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