https://www.marqeta.com/docs/developer-guides/ux-toolkit-release-notes/rss.xml
Faster, more reliable access token requests
Version: 1.19.0Access token requests now time out after 5 seconds, with one automatic retry, instead of hanging indefinitely when a host app’s auth callback is unresponsive. This prevents a slow or unresponsive auth callback from blocking your app.No action is required. You can optionally listen for the newmqAuthCallbackTimeout event to detect when a timeout occurs.New lightweight loading spinner, smaller bundle size
Version: 1.19.0UX Toolkit introducesmq-spinner, a lightweight CSS/SVG loading spinner that replaces the Lottie-based spinner used throughout the SDK. The new spinner matches the look of the legacy spinner — a gray-green arc with a white cap, rotating over one second, and pausing automatically when a cardholder’s device is set to reduce motion — and accepts size and color properties.The loading state of mq-button, mq-file-upload-file, and the statements download button now use mq-spinner instead of the Lottie-based animation. Because these components no longer reference the Lottie animation, the SDK removes the Lottie runtime (approximately 324 KB) from their bundles, including mq-button, which is on the mq-card critical path. This results in a faster load for mq-card and other components that use these elements.Lottie remains in place for the confetti, checkmark, and indeterminate-loader animations. This change doesn’t affect the public API of any existing component.Faster first load for iframe-backed components
Version: 1.20.0Release date: 2026-07-07Each iframe-backed component — including the card and its details, the transaction list, statements, account, and more — now preloads only its own code in parallel on first load. This collapses the cold-start network waterfall, so cardholders see a faster first view. No action is required — this is an automatic performance improvement with no API or behavior change.Faster startup for secure card components
Version: 1.20.0Release date: 2026-07-07The secure card components — card details, PIN, and CVV — now start up faster on first load by initializing earlier and fetching their setup data in parallel. This reduces the time cardholders wait to see sensitive card data. No action is required — this is an automatic performance improvement with no API or behavior change.Faster branding and connection setup on repeat loads
Version: 1.20.0Release date: 2026-07-07Your program’s branding now applies immediately on repeat loads, eliminating the flash of default styling before your branding appears. Network connections also open earlier, speeding up the first load. No action is required — this is an automatic performance improvement with no API or behavior change.Shared cardholder context across components
Version: 1.19.0The SDK now fetches the cardholder context once per page load and shares it across all components, eliminating repeated requests. This reduces the number of API calls your integration generates when multiple components are on the same page.Deduplicated PAN reveal requests across iframes and WebViews
Version: 1.19.0The SDK now deduplicatesGET /cards/{token}/showpan requests, so PCI card components fetch the value once and share the result across same-origin iframes and WebViews. This eliminates duplicate requests and reduces the number of calls made against a PCI-scoped endpoint.Duplicate load-completed events on failed loads
Version: 1.20.0Release date: 2026-07-07Marqeta fixed an issue wheremq-set-pin and mq-external-account-list emitted their load-completed event twice when a load failed. Each component now emits the event exactly once per load, so you can rely on the event count when tracking load outcomes.Version 1.19.1
Release date: 2026-06-22- Marqeta fixed an issue that prevented authenticated mode from working correctly in Studio.