A JSON Parser that is written in just about ~100 lines of code. The main code resides in JsonParser.cs and JsonStack.cs the rest is merely OOP routine.
Just recently during a job interview process, I was asked to provide a solution for a problem that required me to write a JSON (de)serializer using only C# 4.
I wrote the first working version within 3 hours, later on just out of curiosity I did a benchmark and learned that I have written the WORLD's FASTEST JSON (de)serializer.
Here are the results of doing 1000 deserializtion of a JSON:
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SimpleJsonParser: 5ms
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Newtonsoft: 63ms
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Jil: 12ms
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Utf8Json: 21ms