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JavaScript

var jsonData =    [{"label":"Hass1([email protected])","value":"[email protected]"},{"label":"Hass([email protected])","value":"[email protected]"},{"label":"Sam([email protected])","value":"[email protected]"}];

function convert(data) {
    var obj = {};
    for (var i = 0; i<data.length; i++) {
        obj[data[i].label] = data[i].value;
    }
    return obj;
}

console.log(convert(jsonData));