Shopify Scripts Are Deprecated: How to Migrate to Shopify Functions (Complete Guide)

The short version: Shopify Scripts and checkout.liquid stop executing on June 30, 2026 — permanently, with no grace period and no rollback. If your store runs discount, shipping, or payment Scripts, they must be rebuilt as Shopify Functions or that logic simply breaks at checkout. This is the complete migration guide.

We build and migrate Shopify checkout logic, so this is the exact process we run with clients. If you're reading this close to the deadline, skip to "If you're out of time" at the end first.

The deadline — and the one that already passed

Two dates matter:

• June 30, 2026 — the hard cutoff. All Shopify Scripts (and checkout.liquid) stop running. Shopify has confirmed this won't be extended again. No grace period, no rollback.
• April 15, 2026 — the editing freeze (already in effect). Since this date you can no longer create, edit, or publish Scripts. Existing Scripts keep running until June 30 — but if one has a bug, you can't fix it.

So the migration isn't optional and the clock isn't theoretical. Anything still on Scripts after June 30 reverts to default behavior.

What's affected

Shopify Scripts powered three kinds of checkout logic, all of which are at risk:

• Line-item Scripts — custom and combined discounts, tiered/volume pricing, BOGO, cart-based promotions.
• Shipping Scripts — hiding, renaming, reordering, or re-rating delivery options.
• Payment Scripts — hiding, renaming, or reordering payment methods.

Plus the older checkout.liquid customization, which is sunset on the same date. If you're on a customized checkout.liquid, you're migrating to Checkout Extensibility regardless.

What replaces them: Shopify Functions

Shopify Functions are the official replacement. They're small pieces of custom logic (written in Rust or JavaScript, compiled to WebAssembly) that run natively on Shopify's infrastructure — faster than Scripts, with no external server, and friendly to the Built for Shopify performance bar. They cover discounts, delivery and payment customization, and cart/checkout validation, and are delivered as app extensions. (For the deeper "when is a Function the right tool vs. a full app" decision, see Shopify Functions vs Apps.)

Step 1 — Audit your Scripts (use the built-in report)

Don't guess what you're running. Shopify gives you the exact list:

1. In your Shopify admin, go to Apps → Script Editor.
2. In the "Replace your Shopify Scripts" banner, click Replace Shopify Scripts.

The Scripts customizations report lists every active Script, what each one does, and links to recommended replacement apps or Function API tutorials. That report is your migration checklist — export it and work through it line by line.

Step 2 — Choose a path for each Script

There are three ways to recreate each Script. Pick per use case:

Mapping by Script type:

• Discount Scripts → discount Functions (or a discount app). Available on all plans.
• Shipping Scripts → delivery customization Functions (Plus).
• Payment Scripts → payment customization Functions (Plus).

Step 3 — Build and test on a development store

Rebuild the logic, then validate it before touching production:

• Recreate each rule as a Function (or configure the app) on a dev store.
• Test every edge case the Script covered — combinations, thresholds, exclusions, B2B vs DTC, edge quantities.
• Heads-up: a Script and a Function targeting the same checkout logic can conflict if both are live. Don't leave them running in parallel longer than a quick verification.

Step 4 — Cut over to production, then monitor

• Deploy the Function to production.
• Disable the corresponding Script immediately once the Function is verified (to avoid the conflict above).
• Monitor checkout closely for the first days — discounts applying correctly, shipping/payment options behaving, no abandoned-cart spike.

The timeline reality

A focused migration of 5–15 scripts realistically takes 8–14 weeks — scoping, development, QA on a dev store, and a monitored cutover. That's the honest number, and it's why "we'll deal with it later" has run out of road.

If you're out of time

With the deadline days away, an 8–14 week project isn't an option — so triage:

1. Cover what you can with no-code Functions-powered apps now — this keeps the bulk of your discount/shipping/payment logic working past June 30.
2. Prioritise revenue-critical logic — whatever directly affects what customers pay or which options they see.
3. Rebuild the complex, custom rules as Functions right after, on a proper timeline, replacing the stopgap apps where needed.

The one thing you cannot do is nothing — after June 30 there's no Script to fall back on.

We run Scripts-to-Functions migrations end to end — audit, custom Functions, and the production cutover — and we move fast when a deadline is involved. See our Shopify app development and Shopify store development work, or talk to us before June 30.