Bundle Analyzer Pro
Professional JavaScript bundle analysis and optimization
Bundle Upload
Drag and drop bundle files here
Supported formats: JSON, JS, CSS, and bundle analyzer outputs
Analysis Configuration
How to analyze JavaScript bundles online?
Analyze JavaScript bundles with our professional bundle analyzer. Identify optimization opportunities, track dependencies, and improve performance. Perfect for web development, performance optimization, and bundle size management.
Features
- Comprehensive JavaScript bundle size analysis
- Interactive dependency tree visualization
- Performance metrics and optimization recommendations
- Bundle comparison and historical tracking
- Framework-specific analysis (Angular, React, Vue)
- Asset optimization and compression analysis
- Dead code elimination and tree-shaking insights
- Code splitting and lazy loading recommendations
How to use
- Upload your JavaScript bundle file or provide bundle stats
- Select analysis type (size analysis, dependency analysis, or performance)
- Configure analysis parameters and thresholds
- Review the comprehensive analysis results and visualizations
- Explore optimization recommendations and best practices
- Compare with previous versions or export detailed reports
Tips & Best Practices
- Upload stats files from webpack-bundle-analyzer / rollup-plugin-visualizer / vite --report for the most accurate dependency tree.
- Compare two consecutive builds to spot the dependency that ballooned your bundle.
- Use the size and duplicate thresholds in the config to surface the modules worth optimising first.
- Export as JSON or CSV to diff bundles over time in a spreadsheet, or PDF for a stakeholder report.
- Everything runs in your browser; uploaded bundle JSON never leaves your machine.
FAQ
What bundle formats are supported?
We support Webpack, Rollup, Vite, Parcel, and ESBuild bundle formats. You can upload bundle files directly or provide webpack-bundle-analyzer stats.
How accurate is the bundle analysis?
Our analysis uses industry-standard tools and algorithms to provide accurate bundle size measurements, dependency mapping, and optimization recommendations. Results are validated against industry standards to ensure accuracy and reliability across a wide range of input scenarios.
Can I compare different bundle versions?
Yes. You can upload multiple bundle versions and compare them side-by-side to track size changes, identify regressions, and measure optimization improvements.
What optimization recommendations are provided?
We provide specific recommendations for code splitting, lazy loading, tree shaking, dead code elimination, asset optimization, and dependency management. This is designed to handle both simple and complex use cases efficiently, giving professional developers a reliable everyday tool.
Is the tool suitable for large enterprise applications?
Absolutely. The tool is designed for enterprise-scale applications with support for complex dependency graphs and large bundle analysis.
Can I export analysis reports?
Yes. You can export detailed analysis reports in PDF, JSON, or CSV formats for sharing with your team or integration with CI/CD pipelines.
Does the tool support framework-specific analysis?
Yes. We provide specialized analysis for Angular, React, Vue, and other popular frameworks with framework-specific optimization recommendations.
How does dependency visualization work?
Our interactive dependency graph shows module relationships, import/export connections, and helps identify circular dependencies and optimization opportunities.
Can I analyze asset files like images and fonts?
Yes. The tool analyzes JavaScript bundles along with associated CSS, images, fonts, and other assets to provide comprehensive optimization insights.
Is there support for bundle size budgets?
Yes. You can set size thresholds and budgets, and the tool will alert you when bundles exceed recommended limits.
How does performance prediction work?
We estimate transfer time on common connection speeds from the uncompressed and gzipped bundle size, then highlight large or duplicate modules as the candidates with the biggest impact on first-load performance.
Can I integrate this with my build process?
Not directly — this is a browser-side viewer rather than a CI plugin. For pipeline-time analysis use the underlying tools (webpack-bundle-analyzer, rollup-plugin-visualizer, vite --report). You can then drop those stats files in here for ad-hoc visualisation.