Ijson is an iterative JSON parser with a standard Python iterator interface. Ijson provides several implementations of the actual parsing in the form of backends located in ijson/backends: - yajl2_cffi: wrapper around YAJL 2.x using CFFI, this is the fastest. - yajl2: wrapper around YAJL 2.x using ctypes, for when you can't use CFFI for some reason. - yajl: deprecated YAJL 1.x + ctypes wrapper, for even older systems. - python: pure Python parser, good to use with PyPy