CLI to order groceries via reverse-engineered REWE API (Haskell)
I just had the best time learning about the REWE (German supermarket chain) API, how they use mTLS and what the workflows are. Also `mitmproxy2swagger`[1] is a great tool to create OpenAPI spec automatically. And then 2026 feels like the perfect time writing Haskell. The code is handwritten, but whenever I got stuck with the build system or was just not getting the types right, I could fall back to ask AI to unblock me. It was never that smooth before. Finally the best side projects are the ones you actually use and this one will be used for all my future grocery shopping.…
In plain words
This is a command-line tool written in Haskell that enables users to order groceries from REWE, a German supermarket chain, by interfacing with the store's API. The tool was built by reverse-engineering REWE's API endpoints and authentication mechanisms. It is designed for REWE customers who prefer ordering groceries programmatically from their terminal rather than through the web or mobile interface.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I just had the best time learning about the REWE (German supermarket chain) API, how they use mTLS and what the workflows are. Also `mitmproxy2swagger`[1] is a great tool to create OpenAPI spec automatically. And then 2026 feels like the perfect time writing Haskell. The code is handwritten, but whenever I got stuck with the build system or was just not getting the types right, I could fall back to ask AI to unblock me. It was never that smooth before. Finally the best side projects are the ones you actually use and this one will be used for all my future grocery shopping. [1]https://github.com/alufers/mitmproxy2swagger
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