What are Keyed Fragments?

The Fragments declared with the explicit <React.Fragment> syntax may have keys. The general use case is mapping a collection to an array of fragments as below,

function Glossary(props) {
return (
{props.items.map((item) => (
// Without the `key`, React will fire a key warning
<React.Fragment key={item.id}>

Note: key is the only attribute that can be passed to Fragment. In the future, there might be a support for additional attributes, such as event handlers.

May 29, 2022