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.…
CLI to order groceries via reverse-engineered REWE API (Haskell) launched on March 30, 2026 with 205 votes, #154 of 23,380 launches that month and more than 99% of that year's launches.
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
REWE delivery CLI. Contribute to yannick-cw/korb development by creating an account on GitHub.
Rewe seems to not like independent agentic commerce and is actively blocking this CLI, fair choice, less shopping from me, but understandable at the same time. Unfortunately this means the CLI might or might not work depending on their cloudflare tls fingerprinting rules. The korb CLI allows using the REWE APIs programmatically to create baskets and order them for pickup to your local REWE market. The CLI is handwritten in Haskell, but designed to be a CLI mostly used by agents to organise your REWE shopping on your behalf. All output is JSON. In the directory that store the shopping list file I also have a claude.md explaining this process. The magic is the generated template of what I…from github.com
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…
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