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:

• English, 854 bytes: 29029 msg/sec (23.6 MB/sec)

• English, 6.4 KB: 6407 msg/sec (40.3 MB/sec)

• English, 31.2 KB: 1265 msg/sec (38.8 MB/sec)

• English, 61.5 KB: 585 msg/sec (35.2 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:

• Japanese, 14.6 KB: 2227 msg/sec (31.9 MB/sec)

• Japanese, 44.1 KB: 671 msg/sec (29.6 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)

With GHC 7.0.2, the story is mixed: parsing is 20-40% slower than GHC 6.12.3, while encoding performance ranges from about the same to twice as fast (on numeric data).

(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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• 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