how to create matrix summary of json data

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Javascript

JSON

Dear Friends, How to pivot or row transpose in javascript, stuck at this need urgent help. thanks in Advance

var arr = [
        {"Site":"Site1","Month":"Sep-15",  "Hits": "100"},
        {"Site":"Site1","Month":"Oct-15", "Hits": "200"},
        {"Site":"Site1","Month":"Nov-15", "Hits": "200"},
        {"Site":"Site2","Month":"Sep-15",  "Hits": "100"},
        {"Site":"Site2","Month":"Oct-15", "Hits": "200"},
        {"Site":"Site2","Month":"Nov-15", "Hits": "200"}
        ];

I have above json object where month can be added based on date input from user, I want out put like ---- is just for better visibility of this question

Site------------Sep-15------------Oct-15-------------Nov-15
Site1-----------100---------------200----------------200
Site2-----------100---------------200----------------200
SiteN-------- etc