How to get the index of an object by its property in JavaScript?

To get the index of an object by its property in JavaScript, we use the map and indexOf methods.

For instance, we write

const data = [
  { id: 1, name: "Nick", token: "312312" },
  { id: 2, name: "John", token: "123123" },
];
const index = data.map((e) => e.name).indexOf("Nick");

to call data.map with a callback to return an array with the name property of each object.

And then we call indexOf to get the index of the entry with 'Nick' in the returned array.