GLOSSARY · S
Shopify Functions
Custom backend logic for discounts, shipping, payment and bundles.
WHY IT MATTERS
Why it matters for a Shopify store.
Shopify Functions let developers change how Shopify's backend behaves — discounts, shipping and payment options, cart validation and bundles — with custom logic that runs inside Shopify.
They're fast, run in checkout and replace Shopify Scripts, which makes them central to checkout customisation on modern stores.
HOW CREATIVE LABS HANDLES IT
What we do about it on every project.
01
Pick the right API
Discount, delivery, payment, validation or cart transform — each Function type has its own purpose.
02
Expose settings
Merchants configure thresholds and rules in the admin instead of editing code.
03
Test with real carts
Edge cases from real orders are tested before launch.
EXAMPLE
A typical example.
A store needs to hide express shipping for oversized items.
A delivery customization function checks the cart for oversized products and removes the express option, so the rule runs in checkout without manual order fixes.
COMMON MISTAKES
What usually goes wrong.
Writing functions for native features
Check built-in settings first.
Ignoring performance limits
Functions have strict execution limits; keep logic lean.
No admin settings
Hard-coded rules need a developer for every change.
SHOPIFY FUNCTIONS
2 questions
Do Shopify Functions require Plus?
Apps from the Shopify App Store that use Functions work on all plans; custom apps with your own functions need Shopify Plus.
What languages are Functions written in?
They compile to WebAssembly; Rust and JavaScript are the common choices.
Related terms
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