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2 Fixes: Error – The Response is not a valid JSON Response

While I was writing a blog post a couple of days, I realized an error appears says, the response is not a valid JSON Response in WordPress while uploading images.

Generally, plenty of errors can be discovered while uploading images in WordPress.

This was pretty much weird. Here is how it looks like!

this is not a valid JSON response error

It was new for even me. I had explored a few forums about the same, and most of the folks are facing this in recent days.

Image Uploading Fails in Gutenberg Editor

Though Gutenberg is being revolutionary and comes with plenty of features and Gutenberg block plugins are an ultimate add ons to the community. According to some folks, it’s a new WordPress Gutenberg error. Probably REST API didn’t work while uploading the images. And others have other reasons too.

But, who can wait for the updates and bug to be fixed?

Question is How do I solve ‘the response is not a valid JSON response in WordPress’?

We need a solution. While troubleshooting this issue. I had to check for an internal issue, I installed a plugin Health Check to dig what is causing it. But, that didn’t take me closer to the investigation.

Finally, I found two workarounds, both work good and you can get rid of that error.

Fix 1 – The Response is not a valid JSON response

It’s pretty simple to get rid of this error and upload your images successfully.

Step 1. Select Add Image from your Gutenberg block.

2 Fixes: Error - The Response is not a valid JSON Response 1

Step 2. Now, instead of clicking on upload traditionally for uploading an image, Select Media Library.

Select Media Library in WordPress

Step 3. From this window, switch to the tab Upload FilesSelect Files. And browse the image from your local drive.

Upload Files in WordPress

Surprisingly this step will let you insert the images successfully without any error. ๐Ÿ™‚

Though, it’s not a permanent solution but a perfect workaround if you don’t want to stop your work until WordPress releases their next update or patch.

If you would like to have all the permanent image error solution. The next method that will solve the error response is not a valid JSON response.


Method 2 – Avoid Error While Uploading the Images in WordPress

This is even simple, all you need to do is install a plugin available in Github and the error will be no more.

Step 1. Download Default to GD plugin WordPress Plugin

Download default to GD plugin

Step 2. Install the plugin in your WordPress Site…

Step 3. You are all set no changes required at all.

One of the workarounds will definitely solve the issue of uploading an image.

Note: Well, if have done all the above and it haven’t solved the issue.

Hmm.. You have to ditch Gutenberg editor then at this point, until it get fixed by WordPress.

The only thing you could do is, switch back to the classic editor plugin. Install and the problem will be fixed.

Do you like the trick to upload your images?

I have tried this above method personally on my site, and both worked for me. I now got rid of the response is not a valid JSON response error.

In fact, the plugin method will solve all the image error happens while uploading a picture on your WordPress site.

The Response is not a valid JSON Response

34 thoughts on “2 Fixes: Error – The Response is not a valid JSON Response”

    • Really a nice tip.

      I don’t know if these solutions can help in my own case.

      I receive the “response is not a valid JSON response” error notice only when I update a post in draft and publish modes.

      I will try.

      Thank you

      Reply
  1. It seems to be a “Theme” problem using blocks, I removed my page image and left just TEXT and it still gives the same error when hitting “Publish” – no good, trying another theme!

    Reply
  2. Nothing here fixed anything. This was working perfectly apparently until I installed some updates. I switched browsers. Same result. Select or Upload Media is blank when Upload Files tab is selected in the one fix. The second fix made absolutely no difference at all.

    It worked perfectly. Then I installed updates faithfully. Then it broke. Was it untested?
    I’m running multi-site, multi-domain. And I cannot undo those and fold them out into single domain installations without an insane amount of work. Permissions on the directories involved did not change and appear to be correct as they were when things were working. The ONLY thing I can think of that changed is that I installed updates.

    Now I get the JSON message. When I try one method, it appears it will let me upload pictures. But when I do, it complains about the JSON error. When I try the alternate way, it just gives me a blank “Upload Files” page under the heading and menu. If I clip the Media Library tab, the pictures I uploaded from the past few years are all there in place. I just cannot upload files. I imagine I could upload them in Linux by hand. But things don’t work properly at all.

    Reply
  3. Hello NAVIN Bro
    Your article helped me a lot in fixing this JSON image adding error. I faced this problem several times. I ignored this, but today I googled it. And found your article. It is so simple to fix this problem as you have described.

    Thanks for this bro.

    Reply
  4. I was aI uploaded my file from Localhost to Online Server. I am not able to update any content type even I am not able to delete the sample page content. Is there anyone who can guide me and help with WP Plugin’s option.

    Reply
  5. I have just solved this issue, so I just want to share it here for the others. It took me 3 hours to bypass the “The Response is not a valid JSON Response” and finally upload an image.

    Solution:
    Download the classic editor plugin, and this problem will be solved automatically.
    https://wordpress.org/plugins/classic-editor/

    Then wait until WordPress solves this problem to switch back to block editor

    Reply
  6. HI! I just had the same issue with one particular image and my problem was that it had Thai letters in the title/URL. I removed the characters and it was fine. It might be the same with other characters like : ; / etc. Hope this helps anyone!

    Reply
  7. Hello NAVIN Bro
    Your article helped me a lot in fixing this JSON image adding error. I faced this problem several times. I ignored this, but today I googled it. And found your article. It is so simple to fix this problem as you have described.

    Thanks for this bro.

    Reply
  8. For me, it was because I created my SSL certs and then changed my permalink to post name in wordpress. So all I had to do was renew my SSL again and everything worked fine.

    Reply
  9. Same problem showing here

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

    How can we resolve the issues to publish post?

    Reply
  10. Ohh thanks
    You’ve been so so much helpful
    Nice content..
    I was literally getting tired of this
    “Updating failed. Error message: The response is not a valid JSON Response” problem.

    But thanks once again very very much.

    Reply
  11. Hey the next time this happens please get your hands dirty with a little development stuff.

    open up the Chrome Developer tools (View > Developer > Developer Tools)
    With the developer Tools open , switch to the “Network” tab inside of the developer tools.

    First, get a little comfortable with the “Network” tab– it’s a little tricky if you’ve never seen it. use the slash-in-circle icon (“Clear”) to clear the list of what you’re looking at. that is your friend.

    IN THE OTHER WINDOW (with your WP Admin), repeat the actions that lead to the bug

    When you make the upload, there will be a background request to an endpoint like

    media?locale_user

    this request will appear immediately when you start the upload and it should itself as “finished” when the upload is complete.

    You will want to screenshot the Headers (both Request & response) and also the “Response” tab which shows you the response from the server.

    in my case, I am finding that there is some errant HTML being inserted into the JSON response that is telling the user to redirect to where the media is

    this is a bug and should be reported to the WP maintainers.

    Reply
  12. Hi dear.
    I also have the same problem but little different.The error was occurred when i was updating my about us page.so can you help me out?

    Reply
  13. Thanks for the tips! Using the first fix of uploading via the media library helped me to realize I was getting the error mainly because the image I was using was too large (I’m still new so I didn’t know the specs I needed). It wasn’t telling me what the real issue was when I was trying to directly upload it.

    I had this issue again with a different issue and after resizing it properly it still wasn’t working. I went and updated all my plugins, cleared my cache, saved my work and refreshed the page and then tried again and that worked for me.

    Reply

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