wp_is_json_request()

Checks whether current request is a JSON request, or is expecting a JSON response.

Return

(bool) True if Accepts or Content-Type headers contain application/json. False otherwise.

Source

File: wp-includes/load.php 

function wp_is_json_request() {

	if ( isset( $_SERVER['HTTP_ACCEPT'] ) && wp_is_json_media_type( $_SERVER['HTTP_ACCEPT'] ) ) {
		return true;
	}

	if ( isset( $_SERVER['CONTENT_TYPE'] ) && wp_is_json_media_type( $_SERVER['CONTENT_TYPE'] ) ) {
		return true;
	}

	return false;

}

Uses

Uses Description
wp-includes/load.php: wp_is_json_media_type()

Checks whether a string is a valid JSON Media Type.

Used By

Used By Description
wp-includes/l10n.php: determine_locale()

Determine the current locale desired for the request.
wp-admin/includes/plugin-install.php: plugins_api()

Retrieves plugin installer pages from the WordPress.org Plugins API.
wp-includes/load.php: wp_debug_mode()

Set PHP error reporting based on WordPress debug settings.
wp-includes/functions.php: wp_die()

Kills WordPress execution and displays HTML page with an error message.
wp-includes/admin-bar.php: is_admin_bar_showing()

Determines whether the admin bar should be showing.

Changelog

Version Description
5.0.0 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/wp_is_json_request