1const array = [
2  {id: 12, name: 'toto'},
3  {id: 12, name: 'toto'},
4  {id: 42, name: 'tutu'},
5  {id: 12, name: 'toto'},
6];
7
8const id = 12;
9const count = array.filter((obj) => obj.id === id).length;
10
11console.log(count);