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#52106 closed defect (bug) (fixed)

REST API json_encode error results in `null` response

Reported by:	atimmer	Owned by:	TimothyBlynJacobs
Milestone:	5.7	Priority:	normal
Severity:	normal	Version:
Component:	REST API	Keywords:	has-patch
Focuses:	rest-api	Cc:

Description (last modified by atimmer)

When an endpoint returns data that results in an error when json serialising, the REST API code outputs null. From the code the intention is to output the JSON encoding error instead.

I tested this on 5.4 and 5.6.

A dummy plugin to reproduce this:

<?php
/*
Plugin Name:    REST API Bug
Version:        1.0.0
Description:    Shows a bug in the REST API
*/

add_action( 'rest_api_init', function() {
        register_rest_route(
                'v1',
                '/show-bug',
                array(
                        array(
                                'methods'             => \WP_REST_Server::READABLE,
                                'callback'            => function() {
                                        return new \WP_REST_Response(INF);
                                },
                                'permission_callback' => '__return_true',
                                'args'                => array(),
                        ),
                )
        );
});

Go to /wp-json/v1/show-bug and see that null is the output. Fixing this saves developers time by preventing them from having to debug this.

I believe the expected response is "{"code":"rest_encode_error","message":"Inf and NaN cannot be JSON encoded","data":{"status":500}}". With the PR/patch that is the response I get.

Change History (8)

github-actions[bot] commented on PR #823:

4 years ago #1

Hi @atimmer! 👋

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Thank you,
The WordPress Project

#2 @atimmer
4 years ago

Description modified (diff)

This ticket was mentioned in PR #824 on WordPress/wordpress-develop by technosailor.

4 years ago #3

Keywords has-patch added

Fixes a bug where null responses were sent when a PHP error occurs.

In this case, the array key 0 doesn't exist, so a Notice is thrown. By correcting this inaccurate array key usage, the output is as expected.

I did not include a test with this PR because tests/rest-api/rest-server::test_does_not_echo_body_for_null_responses() already checks null responses. This one fails because of the notice.

Trac ticket: https://core.trac.wordpress.org/ticket/52106