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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
</body>
</html>
 
var  idToCheck="id";
var  valToCheck=5;
var a = [
    {
        "id": 1,
        "title": "my Item",
        "body": ""
    },
    {
        "id": 2,
        "title": "my Item 2",
        "body": ""
    },
    {
        "id": 3,
        "title": "my Item 3",
        "body": ""
    }
];
var wasFound=false;
a.forEach(function(entry) {
   if (entry[idToCheck]==valToCheck) 
    { 
      wasFound=true;
      return;
    }
});
alert(wasFound)
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