Seven techniques
Three built on space filling curves — Hilbert, Gilbert, Gosper — and four reimplementations of published methods: DGrid, CMDS, NMap, GridFit.
When a scatterplot uses glyphs or images instead of points, they overlap, and the plot stops being readable. hagrid moves each point to its own cell on a grid, keeping it as close to where it started as the grid allows.
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One entry point
gridify(data, method, parameters) for all of them, or call a method directly to skip the parameter defaulting.
Honest about limits
Each technique page says what the method refuses and what it gets wrong, with a demo you can make fail.
No framework
ESM, CommonJS and a browser build, TypeScript types included, one runtime dependency.