Filtering array with specific values

filter() is defined on the Array prototype. It cannot be used on object.

You can use Object.keys() to get all the keys in the object and for loop to iterate over them.

// Get all keys from the `obj`
var keys = Object.keys(obj),
    result = {};


// Iterate over all properties in obj
for (var i = 0, len = keys.length; i < len; i++) {
    // If the ID is to be filtered
    if (obj[keys[i]].DepartId === '11') {

        // Add the object in the result object
        result[keys[i]] = obj[keys[i]];
    }
}

var obj = {
    "1": {
        "PerId": "10900662",
        "Name": "Cueball",
        "Email": "[email protected]",
        "DepartId": "11"
    },
    "2": {
        "PerId": "10900664",
        "Name": "Megan",
        "MuEmail": "[email protected]",
        "DepartId": "11"
    },
    "3": {
        "PerId": "10900665",
        "Name": "Beret Guy",
        "MuEmail": "[email protected]",
        "DepartId": "12"
    }
};

var keys = Object.keys(obj),
    result = {};

for (var i = 0, len = keys.length; i < len; i++) {
    if (obj[keys[i]].DepartId === '11') {
        result[keys[i]] = obj[keys[i]];
    }
}

console.log(result);
document.body.innerHTML = '<pre>' + JSON.stringify(result, 0, 4);

I'll recommend to change the data format to use array of objects. Then filter() can be directly applied on array.

var arr = [{
    "PerId": "10900662",
    "Name": "Cueball",
    "Email": "[email protected]",
    "DepartId": "11"
}, {
    "PerId": "10900664",
    "Name": "Megan",
    "MuEmail": "[email protected]",
    "DepartId": "11"
}, {
    "PerId": "10900665",
    "Name": "Beret Guy",
    "MuEmail": "[email protected]",
    "DepartId": "12"
}];

var result = arr.filter(obj => obj.DepartId === '11');
console.log(result);

var arr = [{
    "PerId": "10900662",
    "Name": "Cueball",
    "Email": "[email protected]",
    "DepartId": "11"
}, {
    "PerId": "10900664",
    "Name": "Megan",
    "MuEmail": "[email protected]",
    "DepartId": "11"
}, {
    "PerId": "10900665",
    "Name": "Beret Guy",
    "MuEmail": "[email protected]",
    "DepartId": "12"
}];

var result = arr.filter(obj => obj.DepartId === '11');

console.log(result);
document.body.innerHTML = '<pre>' + JSON.stringify(result, 0, 4);

You're trying to use an array filter on an object. Look over the example again.

$([ // this is an array of objects
    {"name":"Lenovo Thinkpad 41A4298","website":"google222"},
    {"name":"Lenovo Thinkpad 41A2222","website":"google"}
  ])
    .filter(function (i,n){
        return n.website==='google';
    });

filter is prototype of array function not object,so we can not use here.

To achieve output, we can use for-in loop on object

var y = JSON.parse('{"1":{"PerId":"10900662","Name":"Cueball","Email":"[email protected]","DepartId":"11"},"2": {"PerId":"10900664","Name":"Megan","MuEmail":"[email protected]","DepartId":"11"},"3": {"PerId":"10900665","Name":"Beret Guy","MuEmail":"[email protected]","DepartId":"12"}}');

var res = {}
for(var key in y){
  if(y[key].DepartId === '11')
   res[key] = y[key]
}
console.log(res)