更新失败。 错误消息：响应不是有效的 JSON 响应

Question

当我想将特色图片添加到我的 wordpress 帖子“更新失败。错误消息：响应不是有效的 JSON 响应”时出现此错误。

Answer 1

In my case it was due to a web server configuration (Apache2):

AllowOverride None

Changed it to :

AllowOverride All

in

/etc/apache2/apache2.conf

Answer 2

I had the same "not a valid JSON response" error when trying to publish my content. WordPress seems to do a JSON post when publishing a new post/page so I checked the network tab in my Developer Tools. If you check the "response" tab for this JSON call you might see some more details about this invalid JSON response.

In my case (yours might be different) some deprecated debug message was outputted before the actual JSON data and messed up the response. After fixing the deprecated message publishing worked again.

Answer 3

If you are trying this on your local or production wordpress install you may likely get this error as your .htaccess file is not writeable for security reasons.

Error you will see in wordpress admin interface under permalink setting after you change from plain to any mode:

If your .htaccess file was writable, we could do this automatically, but it isn't so these are the mod_rewrite rules you should have in your .htaccess file. Click in the field and press CTRL + a to select all.

Make sure your .htaccess file is writeable whenever you change your permalink setting from PLAIN mode to anyother mode like POST-NAME

Answer 4

For me this error was shown in the backend editor because of a line of text in another file which echoed that line of text on each response. Incl.when WordPress internally made its own request expecting a JSON response. Once i removed that line issue disappeared.

Answer 5

I got the same error:

Updating failed. Error message: The response is not a valid JSON response

after deactivating WordPress plugin Gutenberg. I tried to reactivate it but the error still exists.

The solution to my error was installing the "Classic Editor" plugin.