I just released a first version of i-json, a fast incremental JSON parser: 
https://github.com/bjouhier/i-json

Main features:

   - It is FAST :-), but still slower than JSON.parse :-(. On my bench 
   (parsing a realistic 8 MB JSON file), it comes out as only 60% slower than 
   JSON.parse. In comparison, the pure JS parsers that I have tried are more 
   than 6 times slower than JSON.parse.
   - It is incremental and it works directly on buffers (on strings too 
   :-). So you can call it directly with buffers that you receive through 
   'data' events.
   - It can work either as a DOM parser or an evented one (less events than 
   SAX but probably enough).
   - API is small. The intent is not to provide a sophisticated API but a 
   fast engine around which you can build fancier APIs.
   - It it implemented in C++ but there is a JS fallback implementation in 
   case it does not build. the JS implementation is 2.5 to 3 times slower. I 
   wrote it in JS initially but was not happy with the speed. Both 
   implementations pass the unit test suite.

Bruno

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