JSONからデータを解析して取り出す

const json =
'{"message": "success", "number": 5, "people": [{"craft": "ISS", "name": "Chris Cassidy"}, {"craft": "ISS", "name": "Anatoly Ivanishin"}, {"craft": "ISS", "name": "Ivan Vagner"}, {"craft": "ISS", "name": "Doug Hurley"}, {"craft": "ISS", "name": "Bob Behnken"}]}';

// JSON.parse()メソッドでオブジェクト形式に変換する
getSpacePeople(json);

function getSpacePeople(json) {
const data = JSON.parse(json);
console.log(data.people);
console.log(data.number);
}