Interactive single-page treemap visualizer for cargo-bloat JSON output. Displays binary size contributions as a nested treemap where crates, modules, and submodules are represented as hierarchical rectangles — making it easy to spot the biggest contributors to binary bloat at a glance.
Zero dependencies. Single HTML file. Works offline.
- Nested treemap: crates > modules > submodules > functions, sized proportionally using a squarify layout
- Opacity stacking: each nesting level adds a transparent color layer on the black background — mid-level modules accumulate into richer colors while leaf nodes stay visually distinct
- Color-coded crates: each crate gets a distinct hue via golden-angle spacing for maximum visual contrast between neighbors
- Click to zoom: click any module to zoom in and fill the view, press Escape or use the breadcrumb trail to navigate back out
- Hover tooltip: shows the full Rust path (including trait impls and generics), size in bytes/KB/MB, percentage of text section, and percentage of parent
- Smart Rust path parsing: correctly handles
<Type as Trait>::method,Fn<T>::method, closures, and deeply nested module paths - Automatic remainder grouping: items below the threshold are grouped into a
[N smaller items]block with a distinct striped style — only when the grouped total stays small relative to the parent - Adjustable threshold: slider to control remainder grouping sensitivity (0.5% – 8%)
- Multiple input methods: drag & drop, file picker, paste JSON dialog, or
?url=query parameter - Info bar: shows file size, text section size, function count, and crate count
- Responsive: adapts to window resizes
- Overlapping borders: child borders sit on top of parent borders to avoid staircase artifacts at deep nesting
Generate cargo-bloat JSON:
cargo bloat --release --message-format=json > bloat.jsonThen open the visualizer:
- Drag & drop the JSON file onto the page
- Use the "Load JSON" button
- Use the "Paste JSON" button (supports Ctrl+Enter to confirm)
- Or pass it via URL:
treemap.html?url=bloat.json
Created with ❤️ for the Rust community at the request of @robbepop.