During your use of WordPress, you create new content and you can’t update it, right after that the system will return an error warning like ” the response is not a valid JSON response “. This error is not too complicated and you can handle it with each of the following ways.
Here are some ways I summarize to fix the error:
1. First you can download the Classic editor plugin:
This error usually occurs on the new Block named Gutenberg in the new WordPress version.
Please disable Gutenberg by executing the Classic editor plugin .
2. It is possible that your functions file has an error on the first line, it could be because you commented the code, for example.
3. Check the static path in Settings => Static path => Post title
4. Disable all Plugins installed in WordPress website.
Disable all plugins on your site and edit the content normally. If you are using the SSL Simple plugin, disable it first. Then try saving at content. If you can save it without getting any errors, reactivate the plugins one by one to check which plugin is causing the error.
Epilogue
Hope the tutorial on how to fix the response is not a valid JSON response error in WordPress.
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