Is include_js_source_maps enabled by default?

No. include_js_source_maps is not in CoreFilters, the default RewriteLevel; it runs only when you enable it by name with EnableFilters.

How do I enable include_js_source_maps on Apache and nginx?

Add ModPagespeedEnableFilters include_js_source_maps on Apache or pagespeed EnableFilters include_js_source_maps; on nginx. On IIS, add pagespeed EnableFilters include_js_source_maps to pagespeed.config.

Include JS source maps (include_js_source_maps)

Category:: JavaScript
CoreFilters:: No
OptimizeForBandwidth:: No
Risk:: Generally safe

Preserves JavaScript source maps through minification by adding a //# sourceMappingURL= comment pointing to the original source map. Enable this if you need to debug minified JavaScript in production.

When to use it

Not in CoreFilters: it runs only when you enable it by name.
Risk rating on these docs: Generally safe.

Risks

The JavaScript filters page lists no specific risks for this filter. If a page misbehaves with it, DisableFilters include_js_source_maps turns it off for the scope you set it in.

Configuration

Enable it in the module configuration, at server, virtual-host or location scope:

Apache

ModPagespeedEnableFilters include_js_source_maps

nginx

pagespeed EnableFilters include_js_source_maps;

IIS (pagespeed.config)

pagespeed EnableFilters include_js_source_maps

Scoping, ForbidFilters and the thresholds filters read: Choosing filters .

Frequently asked questions

What does the include_js_source_maps filter do?: Preserves JavaScript source maps through minification by adding a //# sourceMappingURL= comment pointing to the original source map. Enable this if you need to debug minified JavaScript in production.
Is include_js_source_maps enabled by default?: No. include_js_source_maps is not in CoreFilters, the default RewriteLevel; it runs only when you enable it by name with EnableFilters.
How do I enable include_js_source_maps on Apache and nginx?: Add ModPagespeedEnableFilters include_js_source_maps on Apache or pagespeed EnableFilters include_js_source_maps; on nginx. On IIS, add pagespeed EnableFilters include_js_source_maps to pagespeed.config.

combine_javascript — Combine JavaScript
defer_javascript — Defer JavaScript
extend_cache_scripts — Extend cache for scripts
inline_javascript — Inline JavaScript
make_show_ads_async — Async AdSense
outline_javascript — Outline JavaScript
rewrite_javascript_external — Minify external JavaScript
rewrite_javascript_inline — Minify inline JavaScript

This page is drawn from the include_js_source_maps entry on JavaScript filters. Every filter in one table: PageSpeed filters.