aeson: Fast JSON parsing and encoding
A JSON parsing and encoding library optimized for ease of use and high performance.
To get started, see the documentation for the Data.Aeson module
below.
(A note on naming: in Greek mythology, Aeson was the father of Jason.)
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Flags
Manual Flags
| Name | Description | Default |
|---|---|---|
| ordered-keymap | Use ordered | Enabled |
Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info
Downloads
- aeson-2.3.1.0.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
Maintainer's Corner
For package maintainers and hackage trustees
Candidates
| Versions [RSS] | 0.1.0.0, 0.2.0.0, 0.3.0.0, 0.3.1.0, 0.3.1.1, 0.3.2.0, 0.3.2.1, 0.3.2.2, 0.3.2.3, 0.3.2.4, 0.3.2.5, 0.3.2.6, 0.3.2.7, 0.3.2.8, 0.3.2.9, 0.3.2.10, 0.3.2.11, 0.3.2.12, 0.3.2.13, 0.3.2.14, 0.4.0.0, 0.4.0.1, 0.5.0.0, 0.6.0.0, 0.6.0.1, 0.6.0.2, 0.6.1.0, 0.6.2.0, 0.6.2.1, 0.7.0.0, 0.7.0.1, 0.7.0.2, 0.7.0.3, 0.7.0.4, 0.7.0.5, 0.7.0.6, 0.8.0.0, 0.8.0.1, 0.8.0.2, 0.8.1.0, 0.8.1.1, 0.9.0.0, 0.9.0.1, 0.10.0.0, 0.11.0.0, 0.11.1.0, 0.11.1.1, 0.11.1.2, 0.11.1.3, 0.11.1.4, 0.11.2.0, 0.11.2.1, 0.11.3.0, 1.0.0.0, 1.0.1.0, 1.0.2.0, 1.0.2.1, 1.1.0.0, 1.1.1.0, 1.1.2.0, 1.2.0.0, 1.2.1.0, 1.2.2.0, 1.2.3.0, 1.2.4.0, 1.3.0.0, 1.3.1.0, 1.3.1.1, 1.4.0.0, 1.4.1.0, 1.4.2.0, 1.4.3.0, 1.4.4.0, 1.4.5.0, 1.4.6.0, 1.4.7.0, 1.4.7.1, 1.5.0.0, 1.5.1.0, 1.5.2.0, 1.5.3.0, 1.5.4.0, 1.5.4.1, 1.5.5.0, 1.5.5.1, 1.5.6.0, 2.0.0.0, 2.0.1.0, 2.0.2.0, 2.0.3.0, 2.1.0.0, 2.1.1.0, 2.1.2.0, 2.1.2.1, 2.2.0.0, 2.2.1.0, 2.2.2.0, 2.2.3.0, 2.2.4.0, 2.2.4.1, 2.2.5.0, 2.3.0.0, 2.3.1.0 (info) |
|---|---|
| Change log | changelog.md |
| Dependencies | base (>=4.12.0.0 && <5), bytestring (>=0.10.8.2 && <0.13), character-ps (>=0.1 && <0.2), containers (>=0.6.0.1 && <0.9), data-fix (>=0.3.2 && <0.4), deepseq (>=1.4.4.0 && <1.6), dlist (>=1.0 && <1.1), exceptions (>=0.10.4 && <0.11), generically (>=0.1 && <0.2), hashable (>=1.4.6.0 && <1.5 || >=1.5.0.0 && <1.6), indexed-traversable (>=0.1.2 && <0.2), integer-conversion (>=0.1 && <0.2), integer-gmp, integer-logarithms (>=1.0.3.1 && <1.1), network-uri (>=2.6.4.1 && <2.7), OneTuple (>=0.4.1.1 && <0.5), primitive (>=0.8.0.0 && <0.9 || >=0.9.0.0 && <0.10), QuickCheck (>=2.14.3 && <2.16 || >=2.16.0.0 && <2.17 || >=2.17.1.0 && <2.18 || >=2.18.0.0 && <2.19), scientific (>=0.3.7.0 && <0.4), semialign (>=1.3 && <1.5), strict (>=0.5 && <0.6), tagged (>=0.8.7 && <0.9), template-haskell (>=2.14.0.0 && <2.25), text (>=1.2.3.0 && <1.3 || >=2.0 && <2.2), text-iso8601 (>=0.1.1 && <0.3), text-short (>=0.1.5 && <0.2), th-abstraction (>=0.5.0.0 && <0.6 || >=0.6.0.0 && <0.7 || >=0.7.0.0 && <0.8), these (>=1.2 && <1.3), time (>=1.8.0.2 && <1.16), time-compat (>=1.9.6 && <1.10), unordered-containers (>=0.2.10.0 && <0.3), uuid-types (>=1.0.5 && <1.1), vector (>=0.13.0.0 && <0.14), witherable (>=0.4.2 && <0.6) [details] |
| Tested with | ghc ==8.6.5 || ==8.8.4 || ==8.10.7 || ==9.0.2 || ==9.2.8 || ==9.4.8 || ==9.6.6 || ==9.8.4 || ==9.10.3 || ==9.12.4 || ==9.14.1 |
| License | BSD-3-Clause |
| Copyright | 2014-2026 Aeson project contributors, 2011-2016 Bryan O'Sullivan, 2011 MailRank, Inc. |
| Author | Bryan O'Sullivan <bos@serpentine.com> |
| Maintainer | Li-yao Xia <lysxia@gmail.com>, Core Libraries Committee |
| Uploaded | by lyxia at 2026-07-05T10:37:44Z |
| Category | Text, Web, JSON |
| Home page | https://github.com/haskell/aeson |
| Bug tracker | https://github.com/haskell/aeson/issues |
| Source repo | head: git clone https://github.com/haskell/aeson.git |
| Distributions | Arch:2.2.2.0, Fedora:2.2.3.0, LTSHaskell:2.2.5.0, Stackage:2.2.5.0 |
| Reverse Dependencies | 2870 direct, 5977 indirect [details] |
| Downloads | 603771 total (401 in the last 30 days) |
| Rating | 3.0 (votes: 45) [estimated by Bayesian average] |
| Your Rating | |
| Status | Docs available [build log] Last success reported on 2026-07-05 [all 1 reports] |
Readme for aeson-2.3.1.0
[back to package description]Welcome to aeson
aeson is a fast Haskell library for working with JSON data.
Join in!
We are happy to receive bug reports, fixes, documentation enhancements, and other improvements.
Please report bugs via the github issue tracker.
Master git repository:
git clone https://github.com/haskell/aeson.git
See what's changed in recent (and upcoming) releases:
Authors
This library was originally written by Bryan O'Sullivan.