Free JavaScript Bundle Analyzer — Find JS Bloat Hurting Performance
Analyze the JavaScript on any page to identify large bundles, unused code, and script blocking issues causing LCP and INP regressions.
Free — no account required for a single check. Sign up for continuous monitoring →
What the JavaScript Bundle Analyzer checks
Total JavaScript bytes
Unused JavaScript percentage
Render-blocking scripts
Long parsing tasks
Script size by domain
Code splitting opportunities
How it works
Loads the page and captures all JavaScript resources, measuring parse time, execution time, and unused bytes using Chrome coverage analysis.
Monitor continuously — not just once
This free tool runs a one-off check. AuditJet monitors your site on a schedule — alerting you when scores change, before performance regressions affect your rankings and revenue.
JavaScript Bundle Analyzer — FAQ
Is the JavaScript Bundle Analyzer free?
Yes — JavaScript Bundle Analyzer is completely free to use. No account required for a single-URL check.
How does the JavaScript Bundle Analyzer work?
Loads the page and captures all JavaScript resources, measuring parse time, execution time, and unused bytes using Chrome coverage analysis.
What does the JavaScript Bundle Analyzer check?
Total JavaScript bytes. Unused JavaScript percentage. Render-blocking scripts. Long parsing tasks. Script size by domain. Code splitting opportunities.
How is this different from Google PageSpeed Insights?
Google PageSpeed Insights is a one-off manual tool. AuditJet adds continuous monitoring, regression alerting, and revenue impact on top of the same performance analysis — so you're notified when scores change, not just when you remember to check.