Uncaught (in promise) syntaxerror: unexpected token < in json at position 0 wordpress

Resolved

Overview of the issue

Some websites may face the following JavaScript console error in the Translation Management Dashboard or Translation Management Jobs pages:

app.js?ver=5.0.4:1 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

This error will also produce a series of PHP warnings like the following:
PHP Warning: Cannot modify header information - headers already sent in /app/public/wp-includes/rest-api/class-wp-rest-server.php on line 1258
PHP Stack trace:
PHP 1. {main}() /app/public/index.php:0
PHP 2. require() /app/public/index.php:17
PHP 3. wp() /app/public/wp-blog-header.php:16
PHP 4. WP->main() /app/public/wp-includes/functions.php:1105
PHP 5. WP->parse_request() /app/public/wp-includes/class-wp.php:737
PHP 6. do_action_ref_array() /app/public/wp-includes/class-wp.php:387
PHP 7. WP_Hook->do_action() /app/public/wp-includes/plugin.php:531
PHP 8. WP_Hook->apply_filters() /app/public/wp-includes/class-wp-hook.php:310
PHP 9. call_user_func_array:{/app/public/wp-includes/class-wp-hook.php:286}() /app/public/wp-includes/class-wp-hook.php:286
PHP 10. rest_api_loaded() /app/public/wp-includes/class-wp-hook.php:286
PHP 11. WP_REST_Server->serve_request() /app/public/wp-includes/rest-api.php:309
PHP 12. WP_REST_Server->send_header() /app/public/wp-includes/rest-api/class-wp-rest-server.php:224
PHP 13. header() /app/public/wp-includes/rest-api/class-wp-rest-server.php:1258

The error is specific to websites running PHP 5.6 and is caused by a deprecation warning triggered by PHP when the $HTTP_RAW_POST_DATA global variable is populated (even if it is not used), as explained here by the author of this change in PHP:

[…] the current way for triggering the deprecated message is a bit sub-optimal (we don’t show you the message when you try to access the $HTTP_RAW_POST_DATA variable, but when $HTTP_RAW_POST_DATA is populated.

The warning explains how to remove the deprecation notice.

Workaround

Editing the php.ini file

1. Find and edit your server’s php.ini file.
2. Look for a line containing the always_populate_raw_post_data string.
3. If the line starts with a semicolon (;), it means it is commented out (and not being used). In this case, remove the semicolon.
4. Check that the full line is always_populate_raw_post_data=-1 (it must end with “=-1”).
5. Restart your server.

Upgrade PHP

Upgrading PHP to a more recent version (7.1 or greater) will remove the deprecation warning.

PHP 7.1 is much faster than PHP 5.6.

PHP 5.6 reached its end-of-life period on 1st of January 2019. This means that it is a “release that is no longer supported. Users of this release should upgrade as soon as possible, as they may be exposed to unpatched security vulnerabilities.” (source: https://www.php.net/supported-versions.php).

Support » Plugin: WooCommerce » syntaxerror: unexpected token < in json at position 0

• There is an error on the checkout page when someone clicks place order. It says syntaxerror: unexpected token < in json at position 0. Also there is jQuery block overlay on the place order section.

  In an urgent need for help, I have users complaining that they cannot make payments and place orders.

  The page I need help with: [log in to see the link]

Viewing 7 replies - 1 through 7 (of 7 total)

• There is a white block over the place order section on the checkout page. Place order button isn’t working. I have disabled all the plugins and also checked in the debugging mode with twenty twenty-one theme. Same issue persists.

  Hi, @abdullahshoyeb !

  I checked your checkout page and couldn’t find the issues you are describing. See the image -> https://snipboard.io/RW7qCA.jpg

  Just so that we get a better understanding here, could you please provide us with a screenshot of the issue?

  I recommend https://snipboard.io for easily sharing screenshots – please follow the instructions on the page, then paste the URL in this chat.

  Also, it would be very helpful if you share a copy of your site’s System Status. You can find it via WooCommerce > Status. Select the Get system report button and then click Copy for support. Once you’ve done that, paste it here in your response.

  Thank you!

  
  ### WordPress Environment ###
  
  WordPress address (URL): https://primeradentalhub.com/test
  Site address (URL): https://primeradentalhub.com/test
  WC Version: 5.9.0
  REST API Version: ✔ 5.9.0
  WC Blocks Version: ✔ 6.1.0
  Action Scheduler Version: ✔ 3.3.0
  WC Admin Version: ✔ 2.8.0
  Log Directory Writable: ✔
  WP Version: 5.8.2
  WP Multisite: –
  WP Memory Limit: 512 MB
  WP Debug Mode: ✔
  WP Cron: ✔
  Language: en_US
  External object cache: –
  
  ### Server Environment ###
  
  Server Info: Apache
  PHP Version: 7.3.31
  PHP Post Max Size: 8 MB
  PHP Time Limit: 30
  PHP Max Input Vars: 1000
  cURL Version: 7.71.0
  OpenSSL/1.1.1d
  
  SUHOSIN Installed: –
  MySQL Version: 5.6.51-cll-lve
  Max Upload Size: 2 MB
  Default Timezone is UTC: ✔
  fsockopen/cURL: ✔
  SoapClient: ✔
  DOMDocument: ✔
  GZip: ✔
  Multibyte String: ✔
  Remote Post: ✔
  Remote Get: ✔
  
  ### Database ###
  
  WC Database Version: 5.9.0
  WC Database Prefix: wpag_
  Total Database Size: 79.05MB
  Database Data Size: 68.21MB
  Database Index Size: 10.84MB
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  ### Post Type Counts ###
  
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  custom_css: 3
  customize_changeset: 20
  elementor_library: 1
  hurrytimer_countdown: 6
  jetpack_migration: 2
  jp_img_sitemap: 1
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  page: 43
  post: 34
  product: 1197
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  shop_order: 262
  shop_order_refund: 2
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  vc_settings_preset: 6
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  wlwl_email: 60
  wpforms: 2
  
  ### Security ###
  
  Secure connection (HTTPS): ✔
  Hide errors from visitors: ✔
  
  ### Active Plugins (44) ###
  
  Redux: by Extendify – 4.3.2
  Advanced Coupons for WooCommerce Free: by Rymera Web Co – 3.0.1
  Advanced Coupons for WooCommerce Premium: by Rymera Web Co – 2.5.2
  Advanced Custom Fields: by Delicious Brains – 5.11
  AfterShip Tracking - All-In-One WooCommerce Order Tracking (Free plan available): by AfterShip – 1.13.7
  Electro Extensions: by MadrasThemes – 3.2.3
  Envato Market: by Envato – 2.0.6
  Facebook for WooCommerce: by Facebook – 2.6.7
  Site Kit by Google: by Google – 1.45.0
  Health Check & Troubleshooting: by The WordPress.org community – 1.4.5
  Insert Headers and Footers: by WPBeginner – 1.6.0
  Jetpack: by Automattic – 10.3
  WPBakery Page Builder: by Michael M - WPBakery.com – 6.7.0
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  One Click Demo Import: by OCDI – 3.0.2
  Order Minimum/Maximum Amount for WooCommerce: by WPFactory – 4.0.7
  WhatsButton - Leads and Order over Chat: by mvvapps – 1.6.0
  Perfect Brands for WooCommerce: by QuadLayers – 1.9.9
  Regenerate Thumbnails: by Alex Mills (Viper007Bond) – 3.1.5
  Shiprocket: by Shiprocket – 1.0.6
  Slide Anything - Responsive Content / HTML Slider and Carousel: by Simon Edge – 2.3.39
  Smart Slider 3: by Nextend – 3.5.1.1
  Velvet Blues Update URLs: by VelvetBlues.com – 3.2.10
  Abandoned Cart Reports For WooCommerce: by Small Fish Analytics – 2.6.2
  WC Cancel Order: by Vikram S – 3.1.2
  WooCommerce Custom Product Addons (Free): by Acowebs – 2.5.6
  Lucky Wheel for WooCommerce: by VillaTheme – 1.0.8.2
  Min Max Quantity & Step Control for WooCommerce: by CodeAstrology – 2.1.0
  Razorpay for WooCommerce: by Team Razorpay – 2.8.0
  Return Refund and Exchange for WooCommerce: by MakeWebBetter – 3.1.3
  WC - APG SMS Notifications: by Art Project Group – 2.24.1
  Checkout Fields Manager for WooCommerce: by QuadLayers – 5.5.0
  WooCommerce - Store Exporter: by Visser Labs – 2.7
  WooCommerce PDF Invoices & Packing Slips: by Ewout Fernhout – 2.10.3
  WooCommerce: by Automattic – 5.9.0
  Yoast SEO: by Team Yoast – 17.5
  WP File Manager: by mndpsingh287 – 7.1.2
  WP Mail SMTP: by WPForms – 3.2.0
  WPForms Lite: by WPForms – 1.7.1.1
  YITH WooCommerce Compare: by YITH – 2.8.0
  YITH WooCommerce Order Tracking: by YITH – 1.5.0
  YITH WooCommerce Social Login: by YITH – 1.4.8
  YITH WooCommerce Wishlist: by YITH – 3.3.0
  
  ### Inactive Plugins (0) ###
  
  ### Dropin Plugins (1) ###
  
  maintenance.php: maintenance.php
  
  ### Settings ###
  
  API Enabled: ✔
  Force SSL: –
  Currency: INR (₹)
  Currency Position: left
  Thousand Separator: ,
  Decimal Separator: .
  Number of Decimals: 2
  Taxonomies: Product Types: external (external)
  grouped (grouped)
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  variable (variable)
  
  Taxonomies: Product Visibility: exclude-from-catalog (exclude-from-catalog)
  exclude-from-search (exclude-from-search)
  featured (featured)
  outofstock (outofstock)
  rated-1 (rated-1)
  rated-2 (rated-2)
  rated-3 (rated-3)
  rated-4 (rated-4)
  rated-5 (rated-5)
  
  Connected to WooCommerce.com: –
  
  ### WC Pages ###
  
  Shop base: #3853 - /shop/
  Cart: #3134 - /cart/
  Checkout: #3135 - /checkout/
  My account: #3854 - /my-account/
  Terms and conditions: #2183 - /terms-and-conditions/
  
  ### Theme ###
  
  Name: Storefront
  Version: 3.9.1
  Author URL: https://woocommerce.com/
  Child Theme: ❌ – If you are modifying WooCommerce on a parent theme that you did not build personally we recommend using a child theme. See: How to create a child theme
  WooCommerce Support: ✔
  
  ### Templates ###
  
  Overrides: –
  
  ### Action Scheduler ###
  
  Complete: 1,806
  Oldest: 2021-11-10 09:41:54 +0000
  Newest: 2021-11-15 07:30:03 +0000
  
  Failed: 4,524
  Oldest: 2021-08-20 04:51:09 +0000
  Newest: 2021-11-09 05:56:45 +0000
  
  Pending: 5
  Oldest: 2021-11-15 17:16:35 +0000
  Newest: 2021-11-22 06:23:11 +0000
  
  ### Status report information ###
  
  Generated at: 2021-11-15 13:01:13 +05:30
  

  Hi @abdullahshoyeb,

  I visited your staging site at the address https://primeradentalhub.com/test – added a product to the cart and reached the checkout page. A spinning/loading circle appears which does not let me place the order.

  I can also see from your System Status Report that you have quite a few active plugins. To troubleshoot this issue, you may want to disable all plugins except WooCommerce.

  If you’re not seeing the same behavior after completing the conflict test, then you know the problem was with the plugins you deactivated.

  Reactivate your other plugins one by one, testing after each, until you find the one causing conflict.

  You can find a more detailed explanation on how to do a conflict test here:

  https://docs.woocommerce.com/document/how-to-test-for-conflicts/

  If the conflict testing doesn’t help, you’d want to check if there are errors on the WooCommerce logs and your console. Kindly provide us the following:

  • Fatal Error Log: Share a copy of any fatal error log found under WooCommerce > System Status > Logs (if available).
  • Developer Console: Right-click on the page or press F12 on the keyboard and select “Inspect” (this option will show up on most browsers). In the developer tools that will pop up you should see a “Console” tab. From there, please send us a screenshot of what’s being displayed using a tool like snipboard.io.

  Thanks!

  Hi there,

  We haven’t heard back from you in a while, so I’m going to mark this as resolved – we’ll be here if and/or when you are ready to continue.

  Sorry sir, due to some technical issues that might be not working properly, But We from the technical team have solved all the problems related to sites also we have added lots of products with huge discounts. I am sure sir you will feel good we added genuine products to it. Thank you for your genuine thought sir.
  Visit us https://primeradentalhub.com/

Viewing 7 replies - 1 through 7 (of 7 total)

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