const aaa = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
const bbb = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
["January","February"]
{"aaa":["January","February"],"bbb":["Jan","Feb"]}
fetch('/data/dictionary.json') // URL json-файла
.then((r) => r.json())
.then((dict) => {
console.log(dict.aaa[1]); // "February"
})
.catch((err) => console.error(err))
;