Howdy, I'd like to present a minimal JSON encoding/decoding library: http://hackage.haskell.org/package/yocto-0.1.2
From the README:
Yocto is exceedingly simple: it only exports one type, Value (which can represent any JSON-encoded data) in addition to Read and Show instances for it--which, respectively, take care of decoding and encoding values automatically. It's worth mentioning that Yocto handles numbers as Rationals rather than Doubles, which makes it faithful to the JSON standard and lets it handle rational numbers of arbitrary magnitude and precision. The name is a play on metric unit prefixes: AttoJson is a tiny JSON library, and Yocto is even smaller. (The entire implementation fits in fewer than 80 lines x 80 columns.) [It is meant primarily for interactive use and one-offs, which is how I'm handwaving hijacking Read and Show.] Anyway, I hope you find it useful; the code lives here: https://github.com/ajg/yocto Alvaro http://alva.ro