Will hiding source maps break my site?

No. Source map references are purely debugging metadata. Removing them has zero impact on functionality, layout, or performance. The only difference is that developers won't see original source code mapped in DevTools.

Should I hide source maps on a development site?

No. On development and staging sites, source maps are useful for debugging. Enable this feature only on production sites where security matters more than debugging convenience.

Does this affect performance?

It can slightly improve performance. When source map references are present, browsers try to fetch .map files. If those files don't exist, the browser makes wasted 404 requests. Removing references eliminates these.

Are the .map files still accessible on the server?

Hiding references removes the pointers so browsers no longer request .map files. However, if someone knows the direct URL, they could still access it. Use WP Ghost's Hide Common Files feature to block .map file extensions entirely.

Does WP Ghost modify any files?

No. WP Ghost strips source map references from output at runtime through WordPress filters. Original files on disk remain untouched. Disabling the option restores references instantly.

Tweaks

How to Hide Source Map References in WordPress

Table of Contents

What Are Source Map References?
Why You Should Hide Source Map References
How to Hide Source Map References with WP Ghost
How to Verify It Worked
Frequently Asked Questions
Related Tutorials

Remove sourceMappingURL and sourceURL references from your site’s frontend output with one toggle in WP Ghost. Source map references are debugging metadata embedded in minified CSS and JavaScript files. They’re invisible to visitors but fully visible in page source and browser DevTools – revealing internal file names, build structures, and project organization to anyone who looks. One toggle strips them all.

What Are Source Map References?

Source map references are lines added to the end of minified CSS and JavaScript files that point browsers to separate .map files. These map files let developers reconstruct the original, unminified source code inside browser DevTools for easier debugging.

Most WordPress themes and plugins ship minified files for performance. Many of them include source map references like these at the bottom:

In JavaScript files:

//# sourceMappingURL=app.min.js.map