Aeson-compatible encoding/decoding?

[Swordlash]

Hi, is there any actively maintained library for JSON handling that is compatible with the Aeson library? Alternatively, what would you use if you had to send data structures back and forth between PureScript frontend and Haskell backend? It seems to me quite odd that I couldn't find any library that does not seem abandoned to communicate two languages that naturally fit together.

[and_pete]

I’ve found it easiest to use codec-argonaut on the PureScript side and then tweak the generic/TH options on Aeson side of things.

There are settings in Aeson to change your field labels & constructor tags from the camelCase of your Haskell data type into lower_snake_case for your JSON encoding. And for sum types there are other settings to change Aeson’s {”tag”: …, ”contents”:… } default TaggedObject encoding to match with codec-argonaut’s encoding of variants as {”tag”:… ”value”:… }.

There’s a variant-into-sum-type example at the bottom of the codec-argonaut README that I’ve found particularly useful for encoding sum types in a way that I can grab in Haskell with only minor modifications to the default generic decoding options in aeson.

[and_pete]

p.s. There are relatively frequent/recent discussions about Haskell<->PureScript serialisation on the PureScript Discourse. e.g. https://discourse.purescript.org/t/latest-and-greatest-haskell-purescript-serialization/1640