Every **`POST /cart/add.js`** is answered with HTTP 422 and **`{"errors":"Cart Error"}`** although the Payload is according to the actual Cart‑API‑Scheme. I have three separate product choices (single, double and subscription), two of

Technical Q&A
1

Every POST /cart/add.js is answered with HTTP 422 and {"errors":"Cart Error"} although the Payload is according to the actual Cart‑API‑Scheme.

I have three separate product choices (single, double and subscription), two of which were made with Shopify bundle app and one with Seal Subscription App. All products are active for the online shop.

The problem remains even when I disable the Seal Subscriptions rule and the Kip-App which sorts Paypal on top of the payment methods.

I don’t use a classic cart page, but try to go from my “Choice”-page directly to the checkout

The error occurs during add-to-cart before /checkout is adressed. It jumps to the checkout page shortly but then jumps to the landing page.

I asked the Shopify support to check the Cart‑/Checkout‑Logs for these Requests for internal rules or validation of these cart/add.js‑requests refused as „cart error“ (i.e. markets‑limitations, subscriptions‑constraint, app‑hooks, geo‑Block). Support told me that they see where the 422 error occurs but that I should contact the community for help.

2

Hello community, this is my problem with my first shopify shop and I would appreciate every help you can give my on this problem.

4

If you could share your store url it would be helpful for us to understand the issue better.

Best

5

Hello Anmolkumar, thanks a lot for your quick response. I found my error, I actually mixed up product id and variant id. Since ich fixed that, everything is working fine.

6

422 with just “Cart Error” is super vague. Try adding each product type separately (single, double, sub) and see if only one fails—that might narrow it down. Also check if the subscription product’s selling plan is actually attached to the variant. Good luck.