I have data structure similar like this
{"id": 1, "a": [{"id": 2, "b": [{"id": 3, "c": [{"id": 4}]}]}]}
I would like to change every id to null.
I know I could do loops and manually assign null to id. Is there any easy way to do this in JavaScript?
Without changing the object to a JSON string, you could use recursion:
function clearIds(obj) {
if ("id" in Object(obj)) obj.id = null;
Object.values(Object(obj)).forEach(clearIds);
}
// Demo
let obj = {"id": 1, "a": [{"id": 2, "b": [{"id": 3, "c": [{"id": 4}]}]}]};
clearIds(obj);
console.log(obj);This mutates the given object in place.
For fun: the same function as a one-liner:
const clearIds = o => "id" in Object(o) && (o.id = null) || Object.values(Object(o)).forEach(clearIds);
// Demo
let obj = {"id": 1, "a": [{"id": 2, "b": [{"id": 3, "c": [{"id": 4}]}]}]};
clearIds(obj);
console.log(obj);Bravo's comment was illuminating so I hope they don't mind if I expand on it here.
Turn the object into a string.
Parse it back into an object again.
What I didn't know is that JSON.parse has a "reviver" function that allows you to transform the string value as it's being parsed.
const data = {"id": 1, "a": [{"id": 2, "b": [{"id": 3, "c": [{"id": 4}]}]}]};
// Turn the data into a string
const str = JSON.stringify(data);
// Parse the string back to an object
// but using the reviver function to turn the value of any id
// keys to null
const newObj = JSON.parse(str, (key, value) => key === 'id' ? null : value);
console.log(newObj);
replacer for sending dates to WCF
JSON.parse(JSON.stringify(x),(k,v)=>k==='id'?null:v);- of course, this doesn't mutate the original - but you didn't specify if you wanted to mutate in place or not