Deprecated

In favour of
aeson

aeson-native

Fast JSON parsing and encoding (deprecated)

http://github.com/mailrank/aeson

Latest on Hackage:0.3.3.2@rev:1

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.

BSD-3-Clause licensed and maintained by Bryan O'Sullivan

A JSON parsing and encoding library optimized for ease of use and high performance.

Note: if you use GHCi or Template Haskell, please see the README file for important details about building this package, and other packages that depend on it: https://github.com/mailrank/aeson#readme

Parsing performance on a late 2010 MacBook Pro (2.66GHz Core i7), for mostly-English tweets from Twitter's JSON search API:

  • 0.8 KB, 32-bit GHC 6.12.3: 30538 msg/sec (24.9 MB/sec)

  • 0.8 KB, 64-bit GHC 7.0.3: 31204 msg/sec (25.4 MB/sec)

  • 6.4 KB, 32-bit GHC 6.12.3: 6731 msg/sec (42.3 MB/sec)

  • 6.4 KB, 64-bit GHC 7.0.3: 6627 msg/sec (41.7 MB/sec)

  • 11.8 KB, 32-bit GHC 6.12.3: 3751 msg/sec (43.2 MB/sec)

  • 11.8 KB, 64-bit GHC 7.0.3: 3381 msg/sec (38.9 MB/sec)

  • 31.2 KB, 32-bit GHC 6.12.3: 1306 msg/sec (39.8 MB/sec)

  • 31.2 KB, 64-bit GHC 7.0.3: 1132 msg/sec (34.5 MB/sec)

  • 61.5 KB, 32-bit GHC 6.12.3: 616 msg/sec (37.0 MB/sec)

  • 61.5 KB, 64-bit GHC 7.0.3: 534 msg/sec (32.1 MB/sec)

Handling heavily-escaped text is a little more work. Here is parsing performance with Japanese tweets, where much of the text is entirely Unicode-escaped.

  • 14.6 KB, 32-bit GHC 6.12.3: 2315 msg/sec (33.1 MB/sec)

  • 14.6 KB, 64-bit GHC 7.0.3: 1986 msg/sec (28.4 MB/sec)

  • 44.1 KB, 32-bit GHC 6.12.3: 712 msg/sec (30.7 MB/sec)

  • 44.1 KB, 64-bit GHC 7.0.3: 634 msg/sec (27.3 MB/sec)

  • 82.9 KB, 32-bit GHC 6.12.3: 377 msg/sec (30.5 MB/sec)

  • 82.9 KB, 64-bit GHC 7.0.3: 332 msg/sec (26.9 MB/sec)

Encoding performance on the same machine and data:

  • English, 854 bytes: 43439 msg/sec (35.4 MB/sec)

  • English, 6.4 KB: 7127 msg/sec (44.8 MB/sec)

  • Engish, 61.5 KB: 765 msg/sec (46.0 MB/sec)

  • Japanese, 14.6 KB: 4727 msg/sec (67.5 MB/sec)

  • Japanese, 44.1 KB: 1505 msg/sec (64.8 MB/sec)

(A note on naming: in Greek mythology, Aeson was the father of Jason.)