nix-playgraound/27-haskell-aeson-roundtrip/README.md

27-haskell-aeson-roundtrip

This example shows intermediate Haskell JSON work with explicit Aeson round trips.

It includes:

• custom ToJSON and FromJSON instances for domain types,
• a nested rollout strategy encoded with a stable JSON shape,
• a CLI that prints JSON and decodes it back into a summary, and
• a test suite run by nix flake check.

Useful commands:

nix develop
cabal run
cabal run -- api production 3 platform,security canary:10
cabal test

nix build
./result/bin/mini-manifest api production 3 platform,security canary:10

nix run . -- api production 3 platform,security canary:10
nix flake check