juniorRuby on Rails

What is strong parameters in Rails?

Updated May 24, 2026

Short answer

Strong parameters prevent mass assignment vulnerabilities.

Deep explanation

They whitelist allowed attributes in controller params.

Real-world example

Protecting admin-only fields like role.

Common mistakes

  • Permitting all params using params[:user].

Follow-up questions

  • What is mass assignment?
  • Where is strong params used?

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