New Haskell library brings Elm-style JSON encoding and decoding to Haskell

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Developer Dwayne has released hs-json-codec, a Haskell library that mirrors the JSON decoding and encoding style of Elm's elm/json package. The library is built on top of another library he authored, hs-json-parser, which handles general-purpose JSON parsing and printing. Both libraries were originally created to support his elm2nix project, which converts Elm dependency files into Nix lock files, but are designed for use in any Haskell project. The library allows developers to compose small, reusable decoders and encoders to handle complex JSON structures, including optional fields and nested objects. Elm developers transitioning to Haskell will find the API familiar, as it closely follows the patterns established by Elm's official JSON library.

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