JsRates is a Shopify app designed to offer store owners the ability to set custom shipping rates using JavaScript. Through its versatile scripting capabilities, the app helps merchants establish dynamic shipping rules that can take into account a variety of parameters such as distance, zip/postal codes, metafields, tags, vendor specifics, and third-party APIs. By utilizing JsRates, merchants gain greater control over their shipping logistics, enabling a more tailored and efficient fulfillment process.