Vercel a11y / WCAG 2.2 AA accessibility build step — scan your deploy preview for accessibility violations on every build, fail the deploy on regressions. Works with Next.js, Astro, Remix, SvelteKit. Built for EAA 2025, ADA, Section 508.

Scan, monitor, and identify website accessibility issues across WCAG 2.0, 2.1, 2.2, ADA, Section 508, EN 301 549, UK Equality Act, Australian DDA, and Canada ACA. Get simple issue highlights with recommended fixes.

HTML_CodeSniffer is a client-side JavaScript that checks a HTML document or source code, and detects violations of a defined coding standard.

Takes a GeoJSON feature and returns points at all self-intersections.

Converts a polygon to a line string.

mjml-section

Takes any LineString or Polygon and returns the overlapping lines between both features.

Finds points that fall within polygon(s).

Returns the shortest path from start to end without colliding with any Feature in obstacles.

An ini encoder/decoder for node

Polygonizes a set of lines that represents edges in a planar graph.

Takes polygons or multipolygons and an optional mask, and returns an exterior ring polygon with holes.

Checks if two geometries have an area of overlap without one being completely contained inside the other.

Takes a Feature and a bbox and clips the feature to the bbox using lineclip.

Lightweight utility for input validation and data extraction in Turf.js. Ensures GeoJSON inputs are in the correct format and extracts specific components like coordinates or geometries.

Takes a kinked polygon and returns a feature collection of polygons that have no kinks.

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

C APIs for registering a Node-API module exporting an interface for invoking a binary numerical function.

output coverage reports using Node.js' built in coverage

Takes a line and returns a line at offset by the specified distance.