Invalid DOM property ⚛️ React

Warning: Invalid DOM property `class`. Did you mean `className`?

HTML attribute names were used in JSX instead of their React/DOM property names.

Seen on: React

Meaning

JSX uses DOM property names: className, htmlFor, tabIndex, readOnly, onClick (camelCase events), style objects. Pasted HTML often keeps class/for/onclick strings.

Common causes

  • class instead of className
  • for instead of htmlFor
  • onclick="..." strings instead of onClick={fn}
  • style as a string

⚡ Quick fix

  1. Rename attributes (className, htmlFor)
  2. Use camelCase event handlers
  3. Pass style as an object

Detailed fix by platform

React

  1. <label htmlFor="email" className="label" style={{ color: 'red' }} />

How to diagnose

  1. Attribute — Which one is named?
  2. Recent change — Did it start after a deploy, upgrade, or configuration change? Compare with the last working version.

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