Create/update fails
GraphQL mutations return permission errors; REST POST/PUT fails too.
The SandyboxSmall tools. Specific problems.SHOPIFY · OCTOBER 1, 2026
Your app can keep installing. Its ScriptTag setup cannot.
After October 1, Shopify says ScriptTag create and update calls fail permanently on every API version. If your install or upgrade flow still depends on them, new merchants can lose the storefront behavior your app was supposed to add.
Oct 1create/update stop
Mar 12027 injection stops
$6.99planned release pack
install.ts
await scriptTagCreate({
src: APP_SCRIPT_URL
});PERMANENT FAILURE AFTER OCT 1
THE TRAPOld API versions do not save you.
Shopify says the create/update failure applies to every API version.
new installs ↗app upgrades ↗storefront widgets ↗analytics scripts ↗theme activation ↗
WHAT ACTUALLY BREAKS
The old tag may keep running. Your ability to create its replacement instance does not.
New installs are exposed
An app without a working replacement can install without the storefront functionality the merchant expects.
Migration needs activation QA
App embeds are enabled per theme. Shopify warns not to delete the old ScriptTag until the replacement is confirmed active.
FREE MIGRATION CHECK
Paste the code or config that installs your storefront script.
The scan looks for ScriptTag create/update calls and legacy endpoints, then points you toward the replacement path Shopify documents.
PLANNED $6.99 RELEASE PACK
Do not turn a ScriptTag migration into a storefront outage.
The pack is designed around the risky part after code replacement: choosing the right extension, activating it, confirming the published theme, avoiding a gap, and cleaning up the old tag only after verification.
- ScriptTag inventory and create/update audit
- App embed vs web pixel decision map
- Merchant activation/deep-link checklist
- Published-theme verification and safe overlap sequence
SOURCE OF TRUTH