<input type="text" value="test@gmail.com" class="form-control CCContactList" />

$(document).on('keyup', ".CCContactList", function(e) {
    e.preventDefault();

        var cemaillist =  [
        {"name": "John@gmail.com", },
        {"name": "doe123@gmail.com",},
        {"name": "kevi@gmail.com", }
    ];

        $('.CCContactList').tagsinput({
            typeahead: {
                source: cemaillist.map(function(item) {
                    return item.name
                }),
                afterSelect: function() {
                    this.$element[0].value = '';
                },
                hint: true,
                highlight: true,
                minLength: 1,
            }
        });

});

var cemaillist=[ {
  "John": "John@gmail.com",},
{"Doe": "doe123@gmail.com",},
{"Kavin": "kevi@gmail.com",}];

$(document).ready(function() {
    $('.form-control').keyup();
});