Key Takeaways
- Shopify Scripts will be removed on June 30, 2026, so migration work now has a real finish line.
- Most stores are not replacing one script. They are replacing several behaviors spread across discounts, shipping, payment, and cart logic.
- The scripts customizations report is the best place to start because it turns guesswork into a migration backlog.
- A phased rollout beats a big-bang rewrite, especially when multiple functions can affect the same checkout flow.
For years, Shopify Scripts sat in a weird category of work: important enough to affect conversion, invisible enough to avoid cleanup.
That era is over.
Shopify has now said Shopify Scripts will be removed on June 30, 2026. If your store still depends on the Script Editor for discount logic, shipping incentives, or payment rules, you need a migration plan that is more specific than “we’ll move it to Functions later.”
Here is the practical way to do it.
First, stop thinking of this as one project
Scripts were a flexible container. Shopify Functions is a set of targeted capabilities.
That means a single legacy script might become multiple new implementations.
Common mappings look like this:
- line item discounts -> discount functions
- cart reshaping logic -> cart transform functions
- validation rules -> cart and checkout validation functions
- payment method hiding or sorting -> payment customizations
- shipping method rules -> delivery customizations or discount functions
If you try to port everything line-for-line, you will make the migration harder than it needs to be.
Start with the scripts customizations report
Shopify gives merchants a scripts customizations report so you can see what is still active and what category of behavior it affects.
That matters because many merchants no longer remember:
- which scripts are still published
- which scripts are duplicated
- which logic was replaced by an app years ago
- which scripts only fire in edge cases
Your first goal is not to rewrite code. It is to sort the backlog into:
- remove entirely
- replace with native Shopify capability
- replace with Functions
- replace with app-supported logic
The migration questions to answer before development starts
For each script, document:
- business purpose
- checkout surface affected
- customer segments affected
- markets affected
- whether stacking rules matter
- whether the behavior is still commercially useful
A painful number of Scripts survive long after the promotion or policy that justified them has already expired.
A better rollout sequence
Phase 1: remove dead scripts
Delete anything obsolete before you build replacements. The best migration is the one you do not have to do.
Phase 2: rebuild the safest logic first
Simple fixed discount logic is a better early win than a heavily branched shipping or payment rule system.
Phase 3: handle interactions
The hard part is not writing one function. The hard part is checking how multiple customizations interact with:
- discount combinations
- Shopify Markets
- subscriptions
- B2B pricing
- gift cards
- accelerated checkout flows
Phase 4: test in controlled scenarios
Create explicit QA cases:
- domestic versus international carts
- high AOV versus low AOV
- tagged customer versus untagged customer
- subscription versus one-time purchase
- stacked discount conditions where applicable
Where merchants usually get burned
They migrate logic without rethinking the offer
A lot of script logic was written to work around limitations that no longer exist. Functions migration is a chance to simplify promotions and policy rules, not just rebuild them.
They do not define success metrics
If the script affected conversion, AOV, shipping margin, or payment mix, define what “working” means before launch.
They leave too little time for QA
Checkout behavior needs edge-case testing. Functions are powerful, but the risk is in the interaction between new logic and everything else already in the store.
The cleanest way to organize the work
Use one migration board with four swim lanes:
- discounts
- shipping
- payments
- cart behavior
For each item, include:
- current script name
- future-state owner
- target replacement method
- dependencies
- test cases
- go-live date
That turns a scary technical sunset into a manageable release plan.
What to do this month
If you are a Plus merchant still using Scripts, the right next move is:
- pull the scripts report
- classify every script
- delete the dead ones
- scope the remaining logic by business impact
- ship replacements in phases before June 30, 2026 becomes a panic deadline
The stores that struggle with this migration are not usually under-skilled. They are under-documented.
Fix the inventory first. The code comes after that.
