Is disable_javascript enabled by default?

No. disable_javascript is in the dangerous set, which no RewriteLevel enables, not even AllFilters. Enable it by name, for testing and measurement only.

How do I enable disable_javascript on Apache and nginx?

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

filter · JavaScript filters

Disable JavaScript (disable_javascript)

Q: What does the disable_javascript filter do?

Wraps every in so no script on the page runs, to measure what the page looks like and costs without JavaScript. For measurement only. In the dangerous set.

Category:: JavaScript
CoreFilters:: No
OptimizeForBandwidth:: No
Risk:: Dangerous set

Wraps every <script> in <noscript> so no script on the page runs, to measure what the page looks like and costs without JavaScript. For measurement only. In the dangerous set.

When to use it

In the dangerous set: no RewriteLevel enables it, not even AllFilters. It exists for testing and measurement, not for production traffic.
Risk rating on these docs: Dangerous.

Risks

The JavaScript filters page lists no specific risks for this filter. If a page misbehaves with it, DisableFilters disable_javascript 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 disable_javascript

nginx

pagespeed EnableFilters disable_javascript;

IIS (pagespeed.config)

pagespeed EnableFilters disable_javascript

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

Frequently asked questions

What does the disable_javascript filter do?: Wraps every <script> in <noscript> so no script on the page runs, to measure what the page looks like and costs without JavaScript. For measurement only. In the dangerous set.
Is disable_javascript enabled by default?: No. disable_javascript is in the dangerous set, which no RewriteLevel enables, not even AllFilters. Enable it by name, for testing and measurement only.
How do I enable disable_javascript on Apache and nginx?: Add ModPagespeedEnableFilters disable_javascript on Apache or pagespeed EnableFilters disable_javascript; on nginx. On IIS, add pagespeed EnableFilters disable_javascript to pagespeed.config.

combine_javascript — Combine JavaScript
defer_javascript — Defer JavaScript
extend_cache_scripts — Extend cache for scripts
include_js_source_maps — Include JS source maps
inline_javascript — Inline JavaScript
make_show_ads_async — Async AdSense
outline_javascript — Outline JavaScript
rewrite_javascript_external — Minify external JavaScript

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