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Shopify API changes
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Request a bundle size exception for existing UI extensions

doc:019fb619-9b4a-74ac-a83e-3ffa98844fb4::feed/https://shopify.dev/changelog/request-a-bundle-size-exception-for-existing-ui-extensions
Product
Shopify Admin GraphQL API
Source
Feed
Change kind
Feed Entry
Detected
Last updated

Deterministic evidence

Before / after

Extracted from Shopify's published contract. Open the source ↗

−1+81 change

1 / 1
null
{
"content_hash": "4f80cb929858723963cd5c3d06d3aeef6ed2cd6158b57e97fc0ab823a15d57e9",
"excerpt": "UI extensions using API version 2025-10 or later are limited to a 64 KB compressed JavaScript bundle per extension. Full page customer account extensions may use up to 128 KB. If your extension remains over the limit after optimization, run shopify app build and submit the minified bundle and its esbuild metafile through the bundle size exception form. Shopify will review the contents of your bundle and may grant a limit increase if the remaining bundle weight is unavoidable. Requests will be de…",
"identity": "https://shopify.dev/changelog/request-a-bundle-size-exception-for-existing-ui-extensions",
"link": "https://shopify.dev/changelog/request-a-bundle-size-exception-for-existing-ui-extensions",
"published_at": "2026-09-17T19:30:00Z",
"title": "Request a bundle size exception for existing UI extensions"
}

Interpreted documentation change

What the vendor announced

The evidence describes a new or updated policy for Shopify UI extensions: bundle size limits (64 KB compressed JS for UI extensions using API version 2025-10 or later, and 128 KB for full page customer account extensions) and a process to request an exception by submitting a minified bundle and esbuild metafile via a bundle size exception form for potential increases after review.

Request a bundle size exception for existing UI extensions UI extensions using API version 2025-10 or later are limited to a 64 KB compressed JavaScript bundle per extension. Full page customer account extensions may use up to 128 KB. If your extension remains over the limit after optimization, run shopify app build and submit the minified bundle and its esbuild metafile through the bundle size exception form. Shopify will review the contents of your bundle and may grant a limit increase if the remaining bundle weight is unavoidable. Requests will be de…

Vendor source ↗

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Multi-source correlation

Other Shopify findings correlated with this change across sources.

  1. Potentially breaking
    SDK release 15.0.0sdk:npm/@shopify/shopify-api@15.0.0
    Shopify Admin GraphQL API
  2. Potentially breaking
    SDK release 15.0.0sdk:npm/@shopify/shopify-api@15.0.0
    Shopify Admin GraphQL API