JsRates: Custom JavaScript Shipping Rates for Shopify Stores is a Shopify app that gives merchants unprecedented flexibility to design and deploy custom shipping rules using JavaScript. It supports everything from simple flat rates to complex, dynamic pricing, including live rate calculations, promotional rules, and detailed analytics. The platform is built for developers, advanced eCommerce merchants, and teams that want precise control over shipping logic without compromising workflow speed.

What is JsRates?

JsRates is a JavaScript-based Shopify app that enables you to craft tailored shipping rules. It leverages JavaScript to provide powerful customization capabilities, allowing you to implement virtually any shipping rate scenario your business requires.

What can I build with JsRates?

Custom shipping rules ranging from flat rates to dynamic, data-driven pricing
Live rate integrations from external APIs (couriers, marketplaces, etc.)
Promotional and conditional shipping logic (e.g., free shipping over a threshold, tiered rates)
Detailed analytics and performance insights to refine shipping strategies
API-ready endpoints to apply rules at product, cart, or checkout stages

Who is it for?

Shopify merchants who want a tailored, programmable approach to shipping
Developers and advanced users comfortable with JavaScript
Businesses seeking precise, data-driven shipping optimization

How JsRates works

Write your own JavaScript shipping rules using the provided interface or AI-assisted code generators
Enrich item data, extract product identifiers, and prepare destination and currency context
Retrieve live or computed shipping rates from integrated services
Return shipping results in Shopify-compatible format and deploy at checkout
Use debugging tools, script validation, and test data to ensure accuracy

Core Capabilities

Real-time, live shipping rate calculations
Third-party API connectivity for dynamic rate data
Modular functionality to extend or customize rules
Data and code importation for smooth transitions
VS Code integrations for in-editor development
Performance tracking and analytics
Dedicated API endpoint for easy integration across product, cart, and external apps
Robust debugging and test tooling
Courier API links for direct rate retrieval

How to Use JsRates (Summary)

Write or generate your JavaScript shipping rules using the AI-assisted tools or the user-friendly interface.
Enrich item details and gather necessary destination/currency context.
Connect to live rate providers via API or compute rates locally.
Return rates in Shopify format and deploy at checkout.
Test, validate, and monitor performance to optimize rules over time.

Pricing & Availability

Demo: Free demo plan to explore features with up to 1,000 test requests and 500,000 AI characters for coding
Full plan: $35/month with unlimited requests, full checkout activation, and advanced features
Free for development stores, Shopify partners, and affiliates

Safety & Readiness

Designed for developers and technical teams familiar with JavaScript
Emphasizes testing, validation, and robust debugging to ensure reliable shipping calculations

How it Benefits Your Business

Precise control over shipping economics and customer experience
Ability to adapt quickly to promotions, market changes, and new partnerships
Reduced risk of incorrect shipping charges through live data and validation tooling

What’s Included in the Toolset

AI-assisted coding for faster rule creation
Third-party API connectivity to fetch live rates
Modular functionality to tailor the platform to your needs
Data and code importation for smooth onboarding
VS Code integrations for development efficiency
Performance tracking and analytics
Real-time shipping rates from couriers and platforms
Dedicated API endpoint for seamless integration
Debugging tools and script validation
Test input data for scenario validation
Courier API links for direct rate retrieval

JsRates

Introduction

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JsRates Product Information