Function Lab Documentation
Function Lab is a powerful Shopify app that enables advanced configuration of Shopify Functions through a flexible rule-based engine. Build sophisticated discount logic, customize checkout behavior, and create dynamic cart transformations—all through JSON configuration, no code required.What is Function Lab?
Function Lab leverages Shopify’s Functions API to provide fine-grained control over your store’s pricing, checkout, and cart behavior. Instead of writing and deploying custom functions, you configure rules using a declarative JSON format powered by theshopify-rules-engine.
Key Capabilities
- Product Discounts: Percentage or fixed amount discounts with advanced targeting
- Shipping Discounts: Free shipping, rate adjustments, and method-specific rules
- Order Discounts: Cart-level discounts with flexible targeting
- Delivery Customization: Hide, reorder, or filter shipping methods
- Payment Customization: Control available payment methods
- Cart Transforms: Merge line items into bundles or update cart properties
Why Use Function Lab?
No Code Required
Configure complex business logic through JSON rules instead of writing and maintaining custom functions.Powerful Expression System
Use JMESPath or custom filter syntax to query cart data, customer attributes, product metadata, and more.Dynamic Pricing
Implement tiered pricing, customer-specific rates, geographic pricing, and conditional discounts.Real-Time Testing
Test your configurations directly in the Shopify admin with instant preview feedback.Professional-Grade Features
- Multi-rule strategies with precedence control
- Facts system for complex calculations
- Conditional logic with boolean operations
- Metafield and customer attribute integration
- Performance-optimized evaluation engine
Quick Navigation
New to Function Lab?
Start with the Quick Start Guide to create your first function in 5 minutes.Understanding the Basics
Read Core Concepts to learn the fundamental building blocks: rules, conditions, events, and facts.Building Specific Functions
Jump to Function Types to explore detailed documentation for each function type with examples.Advanced Use Cases
Explore Advanced Features for complex conditions, dynamic values, and performance optimization.Looking for Examples?
Browse the Cookbook for 30+ ready-to-use recipes covering common business scenarios.Need Help?
Check the Troubleshooting Guide for common errors and debugging strategies.Version & Compatibility
This documentation covers Function Lab for Shopify Functions API. All examples are tested and validated against the current Shopify Functions API specification. Requirements:- Shopify Plus plan (required for Functions API access)
- Function Lab app installed from Shopify App Store
- Admin API access for function configuration
What’s in This Documentation
| Section | What You’ll Find |
|---|---|
| Getting Started | Quick start tutorial, core concepts, testing guide, common patterns |
| Function Types | Detailed reference for each function type with parameters and examples |
| Advanced Features | Facts system, complex conditions, dynamic values, optimization |
| Reference | Complete API reference, cookbook recipes, troubleshooting guide |
Community & Support
- GitHub Issues: Report bugs or request features
- Documentation Feedback: Help us improve these docs
- App Support: Contact Function Lab support team
Ready to get started? → Quick Start Guide Want to understand the concepts first? → Core Concepts Looking for specific examples? → Cookbook