Notice that the object presented by @juvian does not have a defined ordering of the keys (in contrast to PHP associative arrays, for example). I guess you want an ordered collection, for which you have to use an array:
var collection = [
{'title': '1', 'subtitle':'sub1', 'contents':'sub content 1'},
{'title': '2', 'subtitle':'sub2', 'contents':'sub content 2'},
{'title': '3', 'subtitle':'sub3', 'contents':'sub content 3'}
];
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