Episode 64 - When Shopify Functions Fail Silently: The 10KB Limit Nobody Told You About
Liquid Weekly Podcast: Shopify Developers Talking Shopify DevelopmentShow Notes
Karl and Taylor are back for a solo episode packed with updates. Taylor breaks down major changes to the Shopify Theme Editor, a big B2B announcement that flipped the script on Plus-only features, and a raft of Dev Changelog items. Karl shares a real-world debugging war story about a Shopify Function that was silently discarding all its input — and the 10KB metafield limit that caused it. SponsorThe Support Heroes - https://thesupportheroes.com/?utm_source=lwSubscribe to Liquid WeeklyDon't miss out on expert insights and tips—subscribe to Liquid Weekly for more content like this: https://liquidweekly.com/Timestamps- 00:00 – Intro & Slim Jim nostalgia- 01:00 – Season 3 check-in- 02:20 – Shopify Theme Editor overhaul walkthrough- 08:00 – Markets in the Theme Editor: a common merchant gotcha- 09:30 – Session restore, Rollouts scheduling in the editor- 12:00 – Shopify SimGem (AI shopper simulation) overview- 15:00 – Karl's PromoParty Pro debugging war story- 19:00 – Shopify Functions: silent failures & the 10KB metafield limit- 22:00 – Dev Dashboard function logs deep dive- 26:00 – Discount function limits (25 per shop) & Functions vs. Shopify Scripts- 31:00 – Checkout extensibility, web components, and useful constraints- 33:00 – Shopify Dev Dashboard updates: Plus shops, role-based access- 36:00 – Headless Shopify app, Storefront API tokens & cart metafields- 37:00 – AuthCrate.shop by Dylan- 39:00 – Cart metafields copying to order metafields- 41:00 – Shopify Partner Town Hall recap- 43:50 – **The Big One: B2B features now available on non-Plus plans**- 50:00 – Taylor's table and chair rental business & Roth IRAs for kids- 56:00 – Dev Changelog rundown- 57:00 – Picks of the WeekResources- [PromoParty Pro](https://apps.shopify.com/promo-party-pro) – Karl's free gift with purchase app (co-built with Curt and Paul)- [AuthCrate.shop](https://authcrate.shop) – Dylan's tool for managing custom Shopify app authentication- [Shopify Headless App](https://apps.shopify.com/headless) – For generating Storefront API tokens without a custom app- [Shopify Dev Dashboard](https://shopify.dev/docs/apps/tools/partner-dashboard/dev-dashboard) – The developer-focused dashboard within the Shopify Partner portal- [Shopify Partner Town Hall Summary (SDA)](https://shopifydevalliance.com) – Taylor's recap in the SDA communityPicks of the WeekKarl: Quest Bake Soft Protein Frosted Cookies – Low-carb, keto-friendly cookies that actually taste good. 1g net carb https://www.questnutrition.com/collections/cookiesTaylor: Granola AI – AI-powered meeting notes that listens locally without needing a bot invite. Works across Zoom, Slack, Teams, and Google Meet. Great for end-of-day debriefs when you're too tired to write things down yourself. https://www.granola.so/
More from Liquid Weekly Podcast: Shopify Developers Talking Shopify Development
Taylor is in India for Shop Quest, so Karl flies solo with Charles Swayne, owner and app developer at JadePuma Apps and the person behind Datify. Charles is 21, learned Python in sixth grade, and now runs a multi-agent development workflow that researches, plans, audits the plan, executes, and tests itself before he ever looks at the code.
Georgi Petrov, CEO and co-founder of Uxify, joins Karl and Taylor to talk about the half of web performance nobody optimizes for: the shopper's device. After building SMS Bump (acquired by Yotpo), ConsentMo, and NitroPack (acquired by WP Engine), Georgi is now tackling device-specific friction, the laggy buttons, layout shifts, and interaction delays that vary wildly from one phone to the next. We get into how Uxify profiles a visitor's capability without touching your code, the specialized agents that fix problems on the fly, the ClickHouse-powered data layer behind it all, and how to think about performance heading into BFCM. Plus the Dev Changelog and Picks of the Week. Sponsor The Support Heroes: https://www.thesupportheroes.com/ Subscribe to Liquid Weekly Don't miss out on expert insights and tips. Subscribe to Liquid Weekly for more content like this: https://liquidweekly.com/ Find Georgi Online Uxify: https://uxify.com/integrations/shopify/ LinkedIn: https://www.linkedin.com/in/georgipetrov/ Timestamps (00:00) Open (00:29) Intros (02:11) Meet Georgi Petrov of Uxify (02:54) Origin story: hardware hacking to his first software (06:03) Finding Shopify: SMS Bump, ConsentMo, and NitroPack (12:23) Making fast decisions and failing cheaply (15:32) Why Uxify: performance is half website, half device (20:11) How it works: profiling devices and adapting on the fly (26:17) Sitting alongside your theme without touching your code (28:26) Real user monitoring and specialized agents (37:47) The tech stack: ClickHouse and heavy browser testing (41:57) Shopify cart variations and a clever checkout fallback (46:24) Prepping for BFCM and who Uxify is for (51:14) Dev Changelog (58:22) Picks of the Week Dev Changelog [action required] Variants now support multiple barcodes: https://shopify.dev/changelog/product-variant-barcode-is-being-replaced-by-barcodes Create and delete dev stores in Shopify CLI: https://shopify.dev/changelog/create-and-delete-dev-stores-in-shopify-cli [action required] Discounts Allocator Function API developer preview has ended: https://shopify.dev/changelog/discounts-allocator-function-api-developer-preview-has-ended Delivery options in Shopify Functions input now expose their metafields: https://shopify.dev/changelog/delivery-options-in-shopify-functions-input-now-expose-their-metafields Prepare your app for the Shopify admin's new look: https://shopify.dev/changelog/prepare-your-app-for-the-shopify-admins-new-look [action required] Updates to Events payloads and subscription configuration: https://shopify.dev/changelog/updates-to-events-payloads-and-subscription-configuration New Pricing audit trail for contextual product variant prices: https://shopify.dev/changelog/pricing-audit-trail-for-contextual-product-variant-prices [breaking api change] [action required] Removed session.currentSession.staffMemberId from POS UI Extensions (2026-10): https://shopify.dev/changelog/removed-session-currentsession-staffmemberid-from-pos-ui-extensions-2026-10 Request a bundle size exception for existing UI extensions: https://shopify.dev/changelog/request-a-bundle-size-exception-for-existing-ui-extensions Picks of the Week Karl: Keto Oreo-style sandwich cookies (about 50 calories each), part of his ongoing tour through packaged keto snacks: https://www.choczero.com/products/keto-sandwich-cookies Georgi: Calisthenics between AI prompts. Knocking out push-ups and squats while waiting on an agent, which he says burns the time well and sharpens his focus when he comes back. Taylor: Ted Lasso, season 4 on Apple TV+. Still, in his words, one of the most wholesome shows around: https://www.imdb.com/title/tt10986410/
Prakhar Shrivastava of FoxSell joins Karl and Taylor to talk about Shop Quest, the Shopify community event he and his team run in Bengaluru, and to prep Taylor for his first trip to India.
In this episode of the Liquid Weekly Podcast, hosts Karl Meisterheim and Taylor Page are joined by Alexander Hupfer, founder of Fusion Metrics and a solo Shopify app developer.
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