JSON format for jQuery UI Autocomplete -

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the documentation jquery ui autocomplete states source property can set url returns suggested items in json format. however, doesn't elaborate further structure of json result supposed like. post example? thanks!

this json format

{source: ["milan", "turin", "venice", "florence", "rome"] }

or source

{source: ["c++", "java", "php", "coldfusion", "javascript", "asp", "ruby"]}

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