Liquid is a simple and fast open-source template language created by Shopify and written in Ruby. It powers Shopify themes and is used to load dynamic content to storefronts. Azure API Management uses the Liquid templating language (DotLiquid) to transform the body of a request or response, which can be effective if you need to reshape the format of your message.

DotLiquid is a .Net port of the popular Shopify’s Liquid templating language, a project that aims to retain the same template syntax as the original while using .NET coding conventions. However, they are not entirely the same and, in some cases, they behave completely differently.

To clear things up, our 12x Azure MVP Sandro Pereira wrote a whitepaper covering Liquid filters in API Management and made it available for free. “Using Liquid filters in API Management to transform messages” covers everything you need to know about Liquid filters and you just need to click here to download it.