Title: WP_REST_Server::get_json_last_error
Published: December 9, 2015
Last modified: February 24, 2026

---

# WP_REST_Server::get_json_last_error(): false|string

## In this article

 * [Description](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#description)
 * [Return](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#wp--skip-link--target)

Returns if an error occurred during most recent JSON encode/decode.

## 󠀁[Description](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#description)󠁿

Strings to be translated will be in format like “Encoding error: Maximum stack depth
exceeded”.

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#return)󠁿

 false|string Boolean false or string error message.

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#source)󠁿

    ```php
    protected function get_json_last_error() {
    	if ( JSON_ERROR_NONE === json_last_error() ) {
    		return false;
    	}

    	return json_last_error_msg();
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/rest-api/class-wp-rest-server.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/rest-api/class-wp-rest-server.php#L1341)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/rest-api/class-wp-rest-server.php#L1341-L1347)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#related)󠁿

| Used by | Description | 
| [WP_REST_Server::serve_request()](https://developer.wordpress.org/reference/classes/wp_rest_server/serve_request/)`wp-includes/rest-api/class-wp-rest-server.php` |

Handles serving a REST API request.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wp_rest_server/get_json_last_error/?output_format=md#changelog)󠁿

| Version | Description | 
| [4.4.0](https://developer.wordpress.org/reference/since/4.4.0/) | Introduced. |

## User Contributed Notes

You must [log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fclasses%2Fwp_rest_server%2Fget_json_last_error%2F)
before being able to contribute a note or feedback.