Last verified 2026-07-15
shopify app proxy breaking cart ajax
App proxies that break cart look like theme bugs. Disable the newest proxy app first, then re-test add-to-cart on mobile.
The actual problem
An app proxy or custom cart.js conflict returns HTML errors — ATC looks fine until cart is empty.
Do this
- Watch Network on ATC/cart change for non-JSON responses.
- Disable the newest app proxy route until cart AJAX is green.
- Pin working app versions during paid campaigns.
- Add cart-line-item count smoke test post-deploy.
Tools for this job
- Tillkiln
Storefront/cart trap detection
Scan the live storefront for stacking, OOS-buyable, and dead links before you blame ads → tillkiln.com.
- Cashkiln checklist
Pre-ads operator checks
Start with the free operator checks → cashkiln.com/leaks.
Related intents
Scan the store before more ad spend
Tillkiln finds checkout and storefront leaks — stacking discounts, OOS still buyable, dead collection links — with a rough $ leak estimate.
Also from Cashkiln
- Tillkiln — scan checkout leaks before you buy more ads
- Netkiln sample — client-ready revenue-health page from a payouts CSV ($19 clean unlock)
- Free leak checklist — six operator checks
Deep-dive report — $29
Self-serve checklist expansion for this query family. PayPal Checkout. No call.