aeson-combinators: Aeson combinators for dead simple JSON decoding

[ bsd3, json, library, text, web ] [ Propose Tags ]

Low overhead value space Decoder on top of Aeson's Parser for combinator style decoding.

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Dependencies aeson, base (>=4 && <5), bytestring, containers, fail, scientific, semigroups, text, time, time-compat, unordered-containers, uuid-types, vector, void [details]
License BSD-3-Clause
Copyright (c) 2020 Marek Fajkus
Author Marek Fajkus <>
Maintainer Marek Fajkus <>
Category Text, Web, JSON
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Source repo head: git clone
Uploaded by MarekFajkus at 2020-10-11T13:14:44Z
Distributions LTSHaskell:, NixOS:, Stackage:
Downloads 2132 total (38 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2020-10-11 [all 1 reports]

Readme for aeson-combinators-

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Aeson Combinators

Build Status Build Status built with nix

Low overhead value space Decoder on top of Aeson's Parser for combinator style decoding.

This library is compatible with GHC 7.6 and later as well as recent versions of GHCJS.

Encoding to JSON is currently not supported but might be added in the future version.

I wrote a blob post describing what this library attempts to solve.


Decoder a type is a function Value -> Parser a the same as fromJSON member function of FromJSON class. This means there should be near zero overhead. Aeson types and functions are reused where possible.


  • Documentation
  • Support for more GHC versions
  • Default decoders for Containers
  • Encoding API


(c) 2020 Marek Fajkus BSD-3-Clause