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React Key Prop Warning in Lists

Console warning: 'Each child in a list should have a unique key prop'. List re-renders cause wrong components to update. List items in wrong order after dynamic changes.

React uses keys to identify list items. Without unique keys, React reuses component instances incorrectly.

Error Messages You Might See

Each child in a list should have a unique key prop Warning: Each child in a React list
Each child in a list should have a unique key propWarning: Each child in a React list

Common Causes

  1. No key prop on list items
  2. Using index as key (breaks when list reorders)
  3. Key not unique across siblings
  4. Key changes on re-render
  5. Using Math.random() for key generation

How to Fix It

Use unique, stable identifiers as keys:

// Bad - using index
{items.map((item, index) => 
  
{item.name}
)} // Good - using unique ID {items.map((item) =>
{item.name}
)} // Good - using combination if no ID {items.map((item) =>
{item.name}
)}

Real developers can help you.

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Frequently Asked Questions

Why not use index as key?

Index changes when list reorders. React reuses wrong component instances. Only use index if list is static.

What makes a good key?

Unique, stable, not derived from other data. IDs from database are ideal. Avoid generating keys from data.

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