WordPress at a glance
function is not described

wp_is_json_media_type() WP 5.6.0

Checks whether a string is a valid JSON Media Type.

No Hooks.

Return

true|false. True if string is a valid JSON Media Type.

Usage

wp_is_json_media_type( $media_type );
$media_type(string) (required)
A Media Type string to check.

Changelog

Since 5.6.0 Introduced.

Code of wp_is_json_media_type() WP 5.7

<?php
function wp_is_json_media_type( $media_type ) {
	static $cache = array();

	if ( ! isset( $cache[ $media_type ] ) ) {
		$cache[ $media_type ] = (bool) preg_match( '/(^|\s|,)application\/([\w!#\$&-\^\.\+]+\+)?json(\+oembed)?($|\s|;|,)/i', $media_type );
	}

	return $cache[ $media_type ];
}