Question

• How can i remove the key’s with null values and form a new json.
• How can iterate this response…. where i want to display.. this key
  ==> corresponding value.

Answer 1

For starters fix your javascript object as what you have posted is full of errors. Once you have a valid array:

var values = [{
    'SPO2': 222.00000,
    'VitalGroupID': 1152,
    'Temperature': 36.6666666666667,
    'DateTimeTaken': '/Date(1301494335000-0400)/',
    'UserID': 1,
    'Height': 182.88,
    'UserName': null,
    'BloodPressureDiastolic': 80,
    'Weight': 100909.090909091,
    'TemperatureMethod': 'Oral',
    'Resprate': null,
    'HeartRate': 111,
    'BloodPressurePosition': 'Standing',
    'VitalSite': 'Popliteal',
    'VitalID': 1135,
    'Laterality': 'Right',
    'HeartRateRegularity': 'Regular',
    'HeadCircumference': '',
    'BloodPressureSystolic': 120,
    'CuffSize': 'XL'
}, {
    'SPO2': 100.00000,
    'VitalGroupID': 1113,
    'Temperature': 32.7777777777778,
    'DateTimeTaken': '/Date(1299856980000-0500)/',
    'UserID': 1,
    'Height': 0,
    'UserName': 'Admin',
    'BloodPressureDiastolic': 78,
    'Weight': 49895.1607,
    'TemperatureMethod': '',
    'Resprate': null,
    'HeartRate': null,
    'BloodPressurePosition': 'Sitting',
    'VitalSite': '',
    'VitalID': 1096,
    'Laterality': '',
    'HeartRateRegularity': 'Regular',
    'HeadCircumference': '',
    'BloodPressureSystolic': 120,
    'CuffSize': ''
}];

then you could loop through it:

for (var i = 0; i < values.length; i++) {
    // this will run for each element of the initial array

    for (var propertyName in values[i]) {
        // this will run for each property of the element
        var propertyValue = values[i][propertyName];

        if (propertyValue == null) {
            // if the value is null remove it
            delete values[i][propertyName];
        } else {
            console.log('name: ' + propertyName + ', value: ' + propertyValue);   
        }
    }
}

Demo.