{"id":8047,"date":"2026-05-08T14:01:06","date_gmt":"2026-05-08T12:01:06","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=8047"},"modified":"2026-06-08T09:33:59","modified_gmt":"2026-06-08T07:33:59","slug":"how-to-fix-the-json-error-in-wordpress","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/en\/knowledgebase\/how-to-fix-the-json-error-in-wordpress\/","title":{"rendered":"How to Fix the JSON Error in WordPress"},"content":{"rendered":"\n<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">The &#8220;Invalid JSON response&#8221; error in WordPress is one of the most frustrating issues because it often appears suddenly while you are trying to save a post or upload an image. This error occurs when the communication between your browser and the <strong>mybox-hosted<\/strong> server is interrupted or formatted incorrectly.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/how-to-fix-the-json-error-in-wordpress\/#Common_Causes_of_JSON_Errors\" >Common Causes of JSON Errors<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/how-to-fix-the-json-error-in-wordpress\/#Step-by-Step_Solutions\" >Step-by-Step Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/how-to-fix-the-json-error-in-wordpress\/#Advanced_Fixes_via_mybox_Panel\" >Advanced Fixes via mybox Panel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/how-to-fix-the-json-error-in-wordpress\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Causes_of_JSON_Errors\"><\/span>Common Causes of JSON Errors<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Mismatched URLs:<\/strong> If your WordPress Address and Site Address don&#8217;t match or use different protocols (HTTP vs. HTTPS).<\/li>\n\n\n\n<li><strong>Permalink Issues:<\/strong> A corrupted <code>.htaccess<\/code> file can break the paths the editor uses to save data.<\/li>\n\n\n\n<li><strong>Security Blocks:<\/strong> Over-aggressive firewalls (like ModSecurity) may block the &#8220;REST API&#8221; requests that WordPress uses.<\/li>\n\n\n\n<li><strong>Plugin Conflicts:<\/strong> A plugin may be outputting extra code or errors that &#8220;pollute&#8221; the JSON response.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step-by-Step_Solutions\"><\/span>Step-by-Step Solutions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">1. Refresh Your Permalinks<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">This is the simplest fix and solves the problem in about 50% of cases by regenerating your site&#8217;s &#8220;map.&#8221;<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Log in to your WordPress dashboard.<\/li>\n\n\n\n<li>Navigate to <strong>Settings &gt; Permalinks<\/strong>.<\/li>\n\n\n\n<li>Without changing anything, scroll to the bottom and click <strong>Save Changes<\/strong>.<\/li>\n\n\n\n<li>Wait for the page to reload, then click <strong>Save Changes<\/strong> a second time for good measure.<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">2. Check Site Address (URL) Settings<\/h4>\n\n\n\n<\/div>\n\n<div id=\"mybox-128340203\" class=\"mybox-content mybox-entity-placement\"><div class=\"early-access-banner-inpost\">\r\n  <div class=\"banner-left-inpost\">\r\n    <div class=\"icon-box-inpost\">\r\n      <img decoding=\"async\" src=\"https:\/\/mybox.com\/help\/wp-content\/uploads\/2026\/02\/square-info-icon.svg\" alt=\"Info\">\r\n    <\/div>\r\n    <div class=\"text-box-inpost\">\r\n      <span class=\"label-inpost\"><span class=\"translation-block translation-block-banner-text\">Early access<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Still need help?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contact our customer service team.<\/span><\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"banner-right-inpost\">\r\n    <a href=\"https:\/\/panel.mybox.com\/helpdesk2\/v\/list\/\" class=\"banner-button-inpost\"><span class=\"translation-block translation-block-banner-text\">Message us<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">If your site recently moved to <strong>mybox<\/strong> or you added an SSL certificate, your URLs might be inconsistent.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Go to <strong>Settings &gt; General<\/strong>.<\/li>\n\n\n\n<li>Ensure both the <strong>WordPress Address (URL)<\/strong> and <strong>Site Address (URL)<\/strong> are identical.<\/li>\n\n\n\n<li>Check that both start with <code>https:\/\/<\/code> if you have an active SSL certificate.<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">3. Use &#8220;Site Health&#8221; to Diagnose the REST API<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">WordPress has a built-in diagnostic tool that can tell you exactly why the JSON is failing.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Go to <strong>Tools &gt; Site Health<\/strong>.<\/li>\n\n\n\n<li>Look for a critical error labeled <strong>&#8220;The REST API encountered an error&#8221;<\/strong>.<\/li>\n\n\n\n<li>If it shows a &#8220;403 Forbidden&#8221; or &#8220;500 Internal Server Error,&#8221; it is likely a security rule or a server-level block.<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">4. Deactivate Conflicts<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">If the error persists, a plugin or your theme might be the culprit.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Deactivate all plugins<\/strong> temporarily via the <strong>Plugins<\/strong> menu.<\/li>\n\n\n\n<li>Try to save your post. If the error is gone, reactivate your plugins one by one until the error reappears.<\/li>\n\n\n\n<li>If plugins aren&#8217;t the issue, try switching to a default theme like &#8220;Twenty Twenty-Four&#8221; to rule out theme-level code errors.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Advanced_Fixes_via_mybox_Panel\"><\/span>Advanced Fixes via mybox Panel<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If the steps above don&#8217;t work, the issue may be at the server level.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ModSecurity Rules:<\/strong> Some security rules are too strict for the WordPress block editor. You can try temporarily disabling ModSecurity in your <strong>mybox panel<\/strong> to see if the error disappears. If it does, you can contact support to whitelist the specific rule being triggered.<\/li>\n\n\n\n<li><strong>Regenerate .htaccess:<\/strong> If your permalinks won&#8217;t save, your <code>.htaccess<\/code> file might be locked. Use FTP to find the file, rename it to <code>.htaccess_old<\/code>, and then go back to WordPress and save your Permalinks again to create a fresh, clean version.<\/li>\n\n\n\n<li><strong>Check PHP Version:<\/strong> Ensure you are running a modern version of PHP (8.1 or higher). You can update this directly in your <strong>mybox panel<\/strong>. Older versions of PHP can cause compatibility issues with the latest WordPress REST API.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The &#8220;Invalid JSON&#8221; error is almost always a communication breakdown. By refreshing your permalinks and ensuring your URLs are consistent on your <strong>mybox-hosted<\/strong> site, you can resolve the majority of these issues. If the error occurs only during image uploads, try uploading the file directly to the <strong>Media Library<\/strong> first as a temporary workaround.<\/p>\n<\/div>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[58],"manual_kb_tag":[3478,4097,5113,7154,8634,8635,8636,8637,8638,8639,190,8640,372,550,718,2433,3471],"class_list":["post-8047","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-web-applications-cms","manual_kb_tag-invalid-json-response","manual_kb_tag-https-configuration","manual_kb_tag-site-health","manual_kb_tag-modsecurity","manual_kb_tag-permalinks-error","manual_kb_tag-modsecurity-rules","manual_kb_tag-theme-conflict","manual_kb_tag-site-health-tool","manual_kb_tag-wordpress-address-mismatch","manual_kb_tag-site-address-mismatch","manual_kb_tag-wordpress","manual_kb_tag-permalink-issues","manual_kb_tag-ssl-certificate","manual_kb_tag-plugin-conflict","manual_kb_tag-htaccess-file","manual_kb_tag-mybox-hosting","manual_kb_tag-wordpress-rest-api"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/8047","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":2,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/8047\/revisions"}],"predecessor-version":[{"id":8048,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/8047\/revisions\/8048"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/media?parent=8047"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manualknowledgebasecat?post=8047"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb_tag?post=8047"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}