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Each child in a list should have a unique key prop

  • React error 'Each child in a list should have a unique key prop.' is a common issue faced by developers.
  • The error often occurs when attempting to map over undefined data.
  • The solution is to implement conditional rendering to check if the data exists before using it.
  • By ensuring data validity before passing it to components, the 'unique key' error can be resolved.

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