The Rocket League Replay Parser decodes a replay and presents a small array of statistics. This tech demo shows the versatility of boxcars, the underlying Rust-based library, as replays are parsed locally within the browser via a Wasm web worker. Additionally, one can instead opt into having the file uploaded to the edge to be parsed.
A similar, but offline tool is rrrocket.
Install mise to setup the dev environment:
mise install
mise exec -- rustup target add wasm32-unknown-unknown
mise run build
mise run dev