How to use 'foreach json jquery' in JavaScript

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function evalJSON(sanitize) {
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  var json = this.unfilterJSON(),
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      cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
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  if (cx.test(json)) {
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    json = json.replace(cx, function (a) {
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      return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
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    });
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  }
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  try {
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    if (!sanitize || json.isJSON()) return eval('(' + json + ')');
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  } catch (e) { }
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  throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
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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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}