[Зосимов]

let arr = [];
let student = {
    name: 'John',
    lastName: 'Doe',
    age: 35,
    gender: 'Male',
    department: 'English',
    car: 'Honda'
};
arr.push(student)
let data = JSON.stringify(arr);

теперь данные выглядят так в файле
[{"name":"John","lastName":"Doe","age":35,"gender": "Male","department":"English","car":"Honda"}]
[{"name":"John","lastName":"Doe","age":35,"gender": "Male","department":"English","car":"Honda"}]
[{"name":"John","lastName":"Doe","age":35,"gender": "Male","department":"English","car":"Honda"}]

осталось только их получить правильно с файла