How to remove a number from an array in JSON?

Question

Node.js

How to remove a number from an array in JSON?
[123, 125, 555]

Answer 1

1. You need to accept the fact that this is also an array
2. You need to realize that node is still a "prefix" to js
3. Solution
3.1. delete method

var a = [123, 125, 555];
delete a[1];
console.log(a);
//[123, null, 555]

Those. null will remain (even if you do JSON.stringify). It most likely is not necessary
3.2. splice method

a.splice(1,1); // первое число это индекс, второе - количество удаляемых. Функция вернёт удаленные элементы, поэтому просто её вызываем
console.log(a);
// [123, 555]

Removed, after serialization ( JSON.stringify(a) ) it won't be present in the string either. But..
3.3. filter method - apply it also to the array a to prove that the element index is still left after the splice function

a = a.filter( (index, value) => index != 1 );
console.log(a);
// [123, 555]

Now, purely
PS, you can choose any suitable method, you don’t need to follow the sequence - I painted it for clarity of the result

Answer 2

Now, just first I'll take out my crystal ball and see how your JSON looks like with numbers...