A point in polygon based on the paper Optimal Reliable Point-in-Polygon Test and Differential Coding Boolean Operations on Polygons

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Proj4js is a JavaScript library to transform point coordinates from one coordinate system to another, including datum transformations.

visx point

Fill a polygon with lines

Finds the nearest point on a line to a given point

determine if a point is inside a polygon with a ray intersection counting algorithm

Checks if a point is inside an area, like a city boundary.

Read/write IEEE754 floating point numbers from/to a Buffer or array-like object

Slim tsParticles bundle — core engine with essential plugins, presets, and interactions for lightweight particle animations. Ready to use components available for React, Vue.js (2.x and 3.x), Angular, Svelte, jQuery, Preact, Riot.js, Inferno.

Finds the nearest point from a FeatureCollection of Features with Point geometries to a given point.

Generate Request to API from Browser

turf destination module

Media Type Database

ECC JS code based on JSBN

Extensible, mobile friendly pan and zoom framework (supports DOM and SVG).

Returns the closest point, of a collection of points, to a line.

Agent-first presentation framework — plan, design, and visually edit HTML slides with Claude Code or Codex, then export to PDF or experimental/unstable PPTX/Figma formats

Lottie and DotLottie player for the web

Takes a triangular plane as a polygon and a point within that triangle, and returns the z-value at that point.