How can I know if in a JSON exists "xxx" key? I need these JSONs to be formatted:
let beforeOne = {
"id": "123",
"aDate": {
"$date": "2022-06-24T00:00:00Z"
}
}
let beforeTwo = {
"id": "123",
"firstDate": {
"$date": "2022-06-24T00:00:00Z"
},
"day": {
"today": {
"$date": "2022-06-24T00:00:00Z"
},
"tomorrow": {
"$date": "2022-06-24T00:00:00Z"
}
}
}
to:
let afterOne = {
"id": "123",
"aDate": new Date("2022-06-24T00:00:00Z")
}
let afterTwo = {
"id": "123",
"firstDate": new Date("2022-06-24T00:00:00Z"),
"day": {
"today": new Date("2022-06-24T00:00:00Z"),
"tomorrow": new Date("2022-06-24T00:00:00Z")
}
}
So basically, I need to find everywhere where "$date" is present, remove it and give the parentKey the value from parentKey.$date with the new Date() constructor. How could I do that? Thanks in advance!
You can use a recursive function for this. Each time you see an object that has a $date key, perform the new Date transformation and return this to the caller:
function transformDates(obj) {
return Object(obj) !== obj ? obj // Primitive
// When it has $date:
: obj.hasOwnProperty("$date") ? new Date(obj.$date)
// Recursion
: Object.fromEntries(
Object.entries(obj).map(([k, v]) => [k, transformDates(v)])
);
}
let beforeOne = {"id": "123","aDate": {"$date": "2022-06-24T00:00:00Z"}}
console.log(transformDates(beforeOne));
let beforeTwo = {"id": "123","firstDate": {"$date": "2022-06-24T00:00:00Z"},"day": {"today": {"$date": "2022-06-24T00:00:00Z"},"tomorrow": {"$date": "2022-06-24T00:00:00Z"}}}
console.log(transformDates(beforeTwo));Note that Stack Snippets converts Date objects back to string when outputting them. This is not what you would see in a browser's console, where you really get a rendering of Date objects.