simplejson (documentation) is a simple, fast, complete, correct and extensible JSON (RFC 4627) encoder/decoder for Python 2.5+. It is pure Python code with no dependencies, but features an optional C extension for speed-ups.
simplejson 2.1.0 is a major update with several new features and bug-fixes:
- Decimal serialization officially supported for encoding with use_decimal=True. For encoding this encodes Decimal objects and for decoding it implies parse_float=Decimal
- Python 2.4 no longer supported (may still work, but no longer tested)
- Decoding performance and memory utilization enhancements http://bugs.python.org/issue7451
- JSONEncoderForHTML class for escaping &, <, > http://code.google.com/p/simplejson/issues/detail?id=66
- Memoization of object keys during encoding (when using speedups)
- Encoder changed to use PyIter_Next for list iteration to avoid potential threading issues
- Encoder changed to use iteritems rather than PyDict_Next in order to support dict subclasses that have a well defined ordering http://bugs.python.org/issue6105
- indent encoding parameter changed to be a string rather than an integer (integer use still supported for backwards compatibility) http://code.google.com/p/simplejson/issues/detail?id=56
- Test suite (python setup.py test) now automatically runs with and without speedups http://code.google.com/p/simplejson/issues/detail?id=55
- Fixed support for older versions of easy_install (e.g. stock Mac OS X config) http://code.google.com/p/simplejson/issues/detail?id=54
- Fixed str/unicode mismatches when using ensure_ascii=False http://code.google.com/p/simplejson/issues/detail?id=48
- Fixed error message when parsing an array with trailing comma with speedups http://code.google.com/p/simplejson/issues/detail?id=46
- Refactor decoder errors to raise JSONDecodeError instead of ValueError http://code.google.com/p/simplejson/issues/detail?id=45
- New ordered_pairs_hook feature in decoder which makes it possible to preserve key order. http://bugs.python.org/issue5381
- Fixed containerless unicode float decoding (same bug as 2.0.4, oops!) http://code.google.com/p/simplejson/issues/detail?id=43
- Share PosInf definition between encoder and decoder
- Minor reformatting to make it easier to backport simplejson changes to Python 2.7/3.1 json module
