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I wrote the article because I write a lot of web applications which a vast majority of the request are JSON. I am about to do a lot of post analysis on JSON sent from the web browser so it is valuable for me to know how fast a language (library) JSON parser is. For highly concurrent webserver it is good to know how fast and efficient the JSON parser is since it will be doing a lot of concurrent parsing of JSON.

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When you're working with streaming JSON like this (or in a web app), it might be easier to use a decoder/encoder. See http://play.golang.org/p/TLNORK2WK9 for an example.

Also fwiw, it has never been my experience that json decoding/encoding become the bottleneck in a web app. I/O (to a database, or the filesystem) is by far the largest bottleneck in any app I've profiled. A good benchmark for a web app language is hard to write, because it tends to depend on (unreliable) IO-bound systems.

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