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It's all very well to write a beautiful RESTful web service in Haskell, but software development is an inherently dynamic activity with your specs in constant flux. We need to be able to constantly revise the API specs and data schema, communicating changes to the whole engineering team, without slowing down the development cycle or risking disaster whenever a production server is upgraded.

In this talk we will introduce api-tools, a freely available Haskell library that provides a DSL for describing and performing data schema migrations on JSON structures. It allows us to write a self-documenting, human-readable schema changelog that can be validated by developers and executed during automated deployments.

Iris Connect are developing a video sharing platform that is being deployed in over a thousand schools worldwide. We'll explain how we are using api-tools to handle change in the data model at the centre of this platform. Finally, we'll reflect on a few serendipitous design decisions and on the advantages Haskell brings us.

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