Render Lists of Elements from an Array

Each React Element in an Array Needs a Unique Key

How to Add Unique Keys to Each React Element in an Array

Not recommended way to assign keys to an array of React elements

Best way to assign keys to an array of React elements

Essential Things to Know About Assigning Keys

Assign a key to each array element when creating the array

Example 1: Incorrect placement of the key prop

Example 2: Correct placement of the key prop

You can’t pass keys from one component to another

Use stable keys from your data instead of generating them during rendering

Example 1: Incorrect place to generate the key prop

Example 2: Correct place to generate the key prop