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Protected Source Maps: Safely Ship Browser Source Maps

·2026.05.14 09:00

Key point

Vercel now hides production source maps behind Vercel Authentication, blocking external access with a 404.

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Details

With Protected Source Maps, you can now protect browser .map files behind Vercel Authentication. Team members can fetch the source maps, but everyone else gets a 404.

Source maps are useful for debugging minified production code, preserving original file names, line numbers, and readable stack traces.

  • Enabled by default for new projects.
  • Existing projects can enable it from Settings → Deployment Protection, with no redeploy required.
vercelauthenticationdeployment-protectionsource-mapsstack-traces
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