How to use 'foreach json object' in JavaScript

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function _do(f) {
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	var i, values;
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	for(; a<args_length; ++a) {
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		values = args[a];
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		for(i in values) if(values.hasOwnProperty(i)) f(values[i], i);
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	}
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}

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function jsonParser(json) {
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  // Number fo indentation
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  n = 2;
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  // Start the loop
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  json.forEach(function(root){
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    root.child.forEach(function(child){            
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      // If line doesn't have HB tag
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      if(root.tags.length < 1){
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        child.indent = root.indent+n;
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      }
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      // If line has HB tag and start with HB tag and not comment
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      else if(root.tags.length > 0 && root.tags[0].position == 0 && !root.content.match(/^\/\/\-*.*/)) {
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          child.indent = root.indent;
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      }
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      else if(root.tags.length > 0 && root.tags[0].position != 0 && !root.content.match(/^\/\/\-*.*/)) {
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          child.indent = root.indent+n;
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      }
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      // If child has child, recursive call  
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      if(child.child.length > 0)
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        jsonParser([child]);
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    });
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  });
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  return json;
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}