index of key value of object of array javascript code example

Example 1: javascript get index of object in array

// Get index of object with specific value in array
const needle = 3;
const haystack = [{ id: 1 }, { id: 2 }, { id: 3 }];
const index = haystack.findIndex(item => item.id === needle);

Example 2: js find index of object by value of property and return it's key

const index = Data.findIndex(item => item.name === 'John');