Convert/access JSON file like DOM in JavaScript without jQuery? -

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i want know how convert or access json file dom in javascript without using jquery.

for example, in json 

{"u1" : "a":1 ,"b":5 ,"c":8 }

how apply dom output this?

if desired structure:

var myobject = {"u1": {"a": 1,"b": 5, "c": 8  }}; alert(myobject.u1.a);

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