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

Parsing performance with GHC 6.12.3 on a late 2010 MacBook Pro (2.66GHz Core i7), for mostly-English tweets from Twitter's JSON search API:

• 854 bytes: 21054 msg/sec (17.1 MB/sec)

• 6.4 KB: 4545 msg/sec (28.6 MB/sec)

• 31.2 KB: 856 msg/sec (26.1 MB/sec)

• 61.5 KB: 403 msg/sec (24.2 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: 1250 msg/sec (17.9 MB/sec)

• 44.1 KB: 363 msg/sec (15.6 MB/sec)

Encoding performance on the same machine and data:

• 854 bytes: 10647 msg/sec (8.7 MB/sec)

• 6.4 KB: 2098 msg/sec (13.2 MB/sec)

• 31.2 KB: 422 msg/sec (12.9 MB/sec)

• 61.5 KB: 219 msg/sec (13.2 MB/sec)

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

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• AdamBergmark, BasVanDijk, BryanOSullivan, HerbertValerioRiedel, phadej, lyxia

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Candidates

• 1.2.0.0, 1.2.3.0, 1.2.4.0, 1.3.0.0, 1.3.1.1, 1.4.1.0, 1.4.2.0, 1.4.3.0, 1.4.4.0, 1.4.6.0, 1.4.7.0, 1.5.0.0, 1.5.5.1, 1.5.6.0, 2.2.2.0