normalizer.js

function normalizeDependOn(key, id) {
  var depend = id || "id";

  return key.reduce(function(data,oldData) {
    data[oldData[depend]] = oldData;
    return data;
  },{});
}

var data = {
 "food": [
    {
      categoryId:"123",
      foods:["ghorme, gheimeh, fesenjoon"]
    },
    {
      categoryId:"345",
      foods:"gilas"
    },
    {
      categoryId:"5456",
      foods:"bademjoon"
    }
 ],

 "category": [
    {
      id:"123",
      name:"khoshmazeha"
    },
    {
      id:"345",
      name:"nestbanha"
    },
    {
      id:"5456",
      name:"eeey"
    }
 ]
};


var normalCategory = normalizeDependOn(data["category"]);
var normalFood = normalizeDependOn(data["food"],"categoryId");
console.log("category",normalCategory);
console.log("food",normalFood);

console.log("delicious foods",normalFood['123'].foods); // ["ghorme, gheimeh, fesenjoon"]