Shopify Script Editor Developer: Scripts vs Functions and When You Need Help

Shopify Script Editor Developer: Scripts vs Functions and When You Need Help

Shopify Plus stores have special powers. One of them is the ability to customize how discounts, shipping, and payments work. For years, this meant using Shopify Scripts and the Script Editor.

But things are changing. Shopify Scripts will stop working on June 30, 2026. Shopify Functions is the new way to do things.

This creates questions. Should you still use Scripts? When do you need a developer? How do you migrate to Functions?

In this guide, you will learn everything you need to know. You will understand both systems. And you will know when and how to get help.

What Is Shopify Script Editor?

Shopify Script Editor is a tool for Shopify Plus stores. It lets you write custom code that changes how checkout works.

Scripts are small programs written in Ruby. They run during checkout. They can change:

• Line item prices - Apply discounts, bundle pricing, or tiered pricing
• Shipping rates - Hide, rename, or modify shipping options
• Payment methods - Show or hide payment options based on conditions

Example Script Uses

Here are common things merchants do with Scripts:

Tiered Discounts Buy 2, get 10% off. Buy 5, get 20% off. Buy 10, get 30% off.

BOGO Deals Buy one, get one free. Or buy one, get second at 50% off.

Free Shipping Thresholds Free shipping when cart is over $100. Or free shipping for VIP customers.

Bundle Pricing Buy specific products together for a special price.

Conditional Payment Options Hide PayPal for large orders. Show special payment for wholesale customers.

Loyalty Discounts Give automatic discounts to customers with specific tags.

Why Scripts Became Popular

Scripts gave Shopify Plus merchants flexibility. You could create promotions that native Shopify could not handle. You controlled exactly how discounts applied.

Many stores built complex discount strategies with Scripts. They became a key reason to upgrade to Plus.

Why Scripts Are Going Away

Shopify announced that Scripts will end on June 30, 2026. This deadline was extended from the original date of August 28, 2025.

The Reasons

Performance Limits Scripts run during checkout. If they are slow, checkout is slow. Ruby-based Scripts had performance limitations.

Maintenance Burden Running custom code for every merchant creates complexity. Shopify has to maintain the Script execution environment.

Modern Architecture Shopify is moving to a new architecture. Shopify Functions fits better with where the platform is going.

Better Developer Experience Functions use modern languages and tools. They are easier to maintain and scale.

What Are Shopify Functions?

Shopify Functions is the replacement for Scripts. It does similar things but works differently.

Key Differences

Language Scripts use Ruby. Functions use WebAssembly (Wasm). You can write Functions in Rust, AssemblyScript, or other languages that compile to Wasm.

Distribution Scripts live in Script Editor on your store. Functions are distributed as apps. You can use apps from the App Store or build custom Functions.

Availability Scripts are Shopify Plus only. Functions work on any Shopify plan through apps. Custom Functions still need development skills.

Performance Functions run faster. They execute in under 5 milliseconds. This is much quicker than Scripts.

Capabilities Functions are still catching up to Scripts in some areas. But Shopify keeps adding new features. By 2026, Functions should cover most Script use cases.

What Functions Can Do Now

Functions currently support:

• Discount Functions - Product discounts, order discounts, shipping discounts
• Shipping Functions - Custom shipping rates, hiding rates
• Payment Functions - Hiding payment methods based on conditions
• Cart and Checkout Validation - Block checkout based on rules
• Fulfillment Constraints - Control fulfillment options

What Functions Will Add

Shopify continues expanding Functions. Coming improvements include:

• Better cart attribute access
• More complex Buy X Get Y logic
• Stacking multiple discounts on one item
• More extensive APIs

Check Shopify's changelog for the latest updates.

Scripts and Functions: Side by Side

Here is a comparison to help you understand both.

When Do You Need a Developer?

You might need a developer for Scripts, Functions, or both.

You Need a Script Developer If:

You Have Complex Scripts to Maintain Your existing Scripts work, but you need changes. A developer who knows Ruby and Script Editor can help.

You Need to Build New Scripts Before Migration You have time until June 2026. A Script might solve your immediate need while you plan for Functions.

Your Scripts Are Broken Something changed and Scripts stopped working. A developer can troubleshoot and fix.

You Need a Functions Developer If:

You Are Migrating from Scripts Your Scripts need to become Functions before the deadline. This is a development project.

You Want to Build New Custom Logic You have discount or checkout needs that apps do not solve. A developer can build custom Functions.

You Want Your Own App You want a custom app that uses Functions. This needs a developer who knows the Shopify app ecosystem.

You Might Not Need a Developer If:

App Store Has Your Solution Many apps now use Functions under the hood. Check the App Store first. Apps like Discount Ninja, Automatic Discount, and others might do what you need.

Your Needs Are Simple Basic discounts and shipping rules might work with native Shopify features. You do not always need custom code.

How to Migrate from Scripts to Functions

If you have Scripts, you need a migration plan. Here is how to approach it.

Step 1: Inventory Your Scripts

First, know what you have. Go to Script Editor and list:

• All active Scripts
• What each one does
• Which business processes depend on them
• How critical each one is

Step 2: Check Shopify's Customizations Report

Shopify provides a Customizations Report for Plus merchants. It shows:

• Your current Scripts
• Recommended Function replacements
• Gaps where Functions cannot yet replace

Use this report to guide your planning.

Step 3: Evaluate Replacement Options

For each Script, you have options:

Option A: Use an App Search the App Store for apps that do what your Script does. Many discount and shipping apps now use Functions.

Pros: Quick to implement, no development needed Cons: Monthly fees, may not match exactly

Option B: Build Custom Functions Hire a developer to build Functions that replicate your Scripts.

Pros: Exact match to your needs, full control Cons: Development cost and time

Option C: Simplify Your Approach Some Scripts are complex because they were possible, not because they were needed. Consider if simpler approaches work.

Pros: Less maintenance, simpler stack Cons: May lose some flexibility

Step 4: Plan Your Timeline

You have until June 30, 2026. That feels far away, but plan ahead.

Suggested timeline:

• Now to 6 months before: Evaluate options, select approach
• 6 to 3 months before: Build and test replacements
• 3 to 1 month before: Migrate to Functions, keep Scripts as backup
• Final month: Confirm everything works, remove Scripts

Do not wait until the last minute. Problems take time to fix.

Step 5: Test Thoroughly

Before switching, test your new Functions:

• Do discounts apply correctly?
• Do edge cases work?
• Does performance hold under load?
• Do other apps and integrations still work?

Run Scripts and Functions together during transition. Compare results.

Step 6: Monitor After Migration

After you switch:

• Watch conversion rates
• Check for customer complaints
• Monitor error logs
• Compare sales data

Catch problems early.

Examples: Scripts vs Functions

Here are examples showing both approaches.

Example 1: Tiered Quantity Discount

With Script Editor (Ruby):

A Script checks the quantity of each line item. If quantity is 5 or more, it applies 20% off. If 2 or more, it applies 10% off. It changes the line price and adds a "Volume discount" message.

With Functions:

You would build a Discount Function app. The logic is similar but in a different language and structure. Or you use an app like Discount Ninja that provides this out of the box.

Example 2: Free Shipping Threshold

With Script Editor:

A Script checks if the cart subtotal is $100 or more. If so, it changes Standard shipping to free and adds a "Free shipping" message.

With Functions:

A Shipping Discount Function can set shipping to free based on cart total. Many shipping apps already do this without custom code.

Example 3: Hide Payment Method

With Script Editor:

A Script checks if the cart subtotal is $5,000 or more. If so, it removes PayPal Express Checkout from available payment options.

With Functions:

A Payment Customization Function can hide payment methods based on conditions. Apps exist for this, or you can build custom.

Finding a Developer

When you need help, here is how to find good developers.

Where to Look

Shopify Partners Directory Shopify lists certified partners. Look for those with Plus and Functions experience.

Shopify Experts Marketplace Shopify's official marketplace connects you with vetted experts.

Referrals Ask other Shopify Plus merchants who they use.

Development Agencies Many agencies specialize in Shopify Plus development.

What to Ask

Experience Questions:

• How many Script migrations have you done?
• Have you built Shopify Functions from scratch?
• Do you know Rust or AssemblyScript?
• Can you show examples of similar work?

Process Questions:

• How do you handle testing?
• What is your timeline estimate?
• How do you handle issues after launch?
• What documentation do you provide?

Pricing Questions:

• Do you charge fixed or hourly?
• What is included in the price?
• Are there ongoing maintenance costs?
• What if scope changes?

Typical Costs

Development costs vary based on complexity.

Simple Script to Function Migration: $2,000-$5,000 per Script

Medium Complexity: $5,000-$15,000 for multiple Scripts with custom logic

Complex Ecosystem: $15,000-$50,000+ for enterprise-level migrations

Ongoing Maintenance: $500-$2,000 per month for support and updates

Get quotes from multiple developers. Compare not just price but experience and approach.

Frequently Asked Questions

Do I have to migrate from Scripts?

Yes, if you want your discount logic to keep working. Scripts stop working June 30, 2026. Anything not migrated will simply stop.

Can Scripts and Functions run together?

Yes, during the transition period. You can have both active. This helps you test Functions before fully switching.

Are Functions as powerful as Scripts?

They are getting there. Functions already cover most use cases. Some edge cases are still being added. Check current capabilities against your needs.

Do I need to know Rust to use Functions?

Not if you use apps built on Functions. Those hide the code from you. If you want custom Functions, someone needs to code them, often in Rust or AssemblyScript.

What if I miss the deadline?

Your Script-based discounts and customizations will stop working. Customers will not get expected discounts. Checkout may behave differently than expected. Do not miss the deadline.

Can I copy my Script code to Functions?

No. They are completely different languages and architectures. Migration requires rewriting, not copying.

Take Action Now

The June 2026 deadline feels far away. But migration takes time. Planning takes time. Testing takes time.

Start now by:

1. Listing all your current Scripts
2. Understanding what each one does
3. Checking if apps can replace them
4. Getting quotes from developers if needed
5. Creating a migration timeline

Do not let this sneak up on you. A smooth transition protects your revenue and customer experience.

If you need help, reach out to Shopify Plus experts. They do this regularly. They know the pitfalls. And they can make sure you are ready before the deadline hits.