topojson/topojson
Some data may be outdated — see provenance labels.
An extension of GeoJSON that encodes topology! 🌐 observed · 2026-10-01
Health v2 · maintenance only
23/100
- Activity 0
- Release rhythm 8
- Longevity 100
Flags: no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 5087
- days_rel: n/a
- days_push: 760
- n_releases_24m: 0
Adoption not part of the score
4906 stars · 683 forks observed · 2026-10-01
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
TopoJSON is a JavaScript library implementing an extension of GeoJSON that encodes topology, stitching geometries together from shared arcs to eliminate redundancy. It enables substantially smaller geospatial files and topology-aware operations like shape simplification and map coloring.
Use cases
- reduce geo file size by encoding shared boundaries once
- simplify map shapes while keeping adjacent regions connected
- build choropleth and cartogram visualizations with d3
- convert between geo and topology-encoded formats
- automatically color maps so neighbors differ
When to choose
- you need compact geospatial data for web maps
- you want topology-preserving simplification of boundaries
- you work with d3 or other topology-aware visualization tools
When to avoid
- you need plain GeoJSON output for tools that don't understand TopoJSON
- you only handle raster or tile-based geospatial data
Facets
library · maturity stable
serialization data-visualization geospatial data-visualization web-development browser geo topology gis maps d3 nodejs javascript
2 sources
- readme: https://github.com/topojson/topojson · fetched 2026-10-01 · b42119989e1c
- registry_npm: https://registry.npmjs.org/topojson · fetched 2026-08-29 · eff000c46d83
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| topojson/topojson | main | 23 |
For agents
markdown · JSON · MCP: product_card(name="topojson/topojson")
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem