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React Fragment Key Warning - No Key Prop

Warning: 'Each child in a list should have a unique key prop' when using fragments. Can't add key to <> syntax. Lists don't render correctly with fragment groups.

Fragments in lists need keys when rendering multiple elements per item. Shorthand <> syntax doesn't support keys.

Error Messages You Might See

Keys should be placed on the outermost element Fragment does not accept keys Each child should have a unique key prop
Keys should be placed on the outermost elementFragment does not accept keysEach child should have a unique key prop

Common Causes

  1. Using <> shorthand fragment in list (can't add key)
  2. Key on parent instead of fragment itself
  3. Not understanding when to use fragments
  4. Mixing fragment and non-fragment items
  5. Complex nested fragments without keys

How to Fix It

Use React.Fragment with key for list items:

// Bad - can't add key to <>  
{items.map(item => (
  <>
    
{item.name}
{item.email}
))} // Good - use React.Fragment with key import { Fragment } from 'react'; {items.map(item => (
{item.name}
{item.email}
))}

Real developers can help you.

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Frequently Asked Questions

Can I add key to <> syntax?

No, use React.Fragment explicitly to add key.

When do I need fragments?

When returning multiple root elements without wrapper div. In lists, only fragments can have keys.

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