# Protected Source Maps: Ship browser source maps securely

DevFeed: [Protected Source Maps: Ship browser source maps securely](<https://devfeed.tech/articles/protected-source-maps-ship-browser-source-maps-securely-1051.md>)

Original publisher: [Read original article](<https://vercel.com/changelog/protected-source-maps-ship-browser-source-maps-securely>)

Author: z0oks

Published: 2026-05-14T00:00:00Z

Content type: release

Language: en

Sources: [Vercel News](<https://devfeed.tech/sources/vercel-news.md>)

Topics: [Vercel](<https://devfeed.tech/topics/vercel.md>), [Authentication](<https://devfeed.tech/topics/authentication.md>), [debug](<https://devfeed.tech/topics/debug.md>), [Deployment](<https://devfeed.tech/topics/deployment.md>), [Code](<https://devfeed.tech/topics/code.md>)

Tags: [authentication](<https://devfeed.tech/tags/authentication.md>), [browser](<https://devfeed.tech/tags/browser.md>), [code](<https://devfeed.tech/tags/code.md>), [debug](<https://devfeed.tech/tags/debug.md>), [deployment](<https://devfeed.tech/tags/deployment.md>), [documentation](<https://devfeed.tech/tags/documentation.md>), [learn](<https://devfeed.tech/tags/learn.md>), [production](<https://devfeed.tech/tags/production.md>), [source](<https://devfeed.tech/tags/source.md>), [vercel](<https://devfeed.tech/tags/vercel.md>)

## AI overview

Vercel's Protected Source Maps restrict access to production browser source maps through Vercel Authentication. Team members can retrieve the maps for readable stack traces and original source files, while other users receive a 404. The feature is enabled by default for new projects, and existing projects can enable it in Deployment Protection settings without redeploying.

## Source excerpt

You can now restrict access to production source maps with Protected Source Maps, which puts browser .map files behind Vercel Authentication. Your team can fetch them; everyone else gets a 404. Source maps are how you debug minified production code. They give you readable stack traces and your original source code, with the real filenames and line numbers intact. New projects have Protected Source Maps enabled by default. Existing projects can opt in from Settings -> Deployment Protection, with no redeploy needed. Learn more in the documentation. Read more