Webpack Analyzer

The tool analyzes webpack stats to deliver a precise view of bundle composition. It accepts a webpack stats.json or compatible manifest, runs a focused analysis, and returns metrics such as total bundle size, per-module contributions, and a clear chunk breakdown. It flags large modules, duplicated dependencies, and potential code-splitting opportunities. The output is designed for frontend engineers and performance specialists seeking actionable data to improve load performance without installing local tooling or maintaining custom scripts.
Conceptually, it parses the module graph, aggregates modules by chunk, and evaluates how changes affect size and loading behavior. Core calculations include total size, per-module sizes, and an estimated gzipped size using a lightweight heuristic. It detects duplicates and shared dependencies, highlights modules suitable for lazy loading, and provides an at-a-glance view of what changes would likely move the needle in performance. Optional comparisons across builds quantify deltas across different stats snapshots.
Who benefits? Frontend engineers, performance analysts, and CI/CD teams aiming to reduce bundle weight and improve time-to-interactive metrics. The tool’s value is its no-install, online availability combined with exportable results, JSON-friendly data, and automation-friendly outputs. Core features include a per-module breakdown, a visualized chunk graph, duplicate detection, lazy-loading indicators, and exportable reports. It supports common webpack configurations and can be reused during development cycles, code reviews, and release checks to validate that optimizations have the intended effect.
Use cases include pre-release optimization, ongoing performance monitoring, and regression detection across commits. Teams rely on concrete numbers to justify changes and to drive data-backed decisions during sprint cycles and CI pipelines.