JSPM

A machine-readable index of all EPSG coordinate systems.

Gets EPSG Code for Various Inputs (incl. OGC WKT, ESRI WKT, GML, Mapfile, PROJ String, Proj4js String, XML)

Simple, Modern Geospatial Bounding Boxes

Transform coordinates from one coordinate system to another.

convert an epsg code to a proj string

Helper library for reprojecting geojson geometries with proj4js, including a number of extra helper utilities

Projection Data Compressed to Fit in the Browser. Includes PROJ4 Strings, ESRI WKT, and OGC WKT

Utility functions for dealing with grid reference systems used in the British Isles.

Fast projector for immutable GeoJSON

An up-to-date* list of all known EPSGs definitions as well as the nadgrid files, which are referenced by at least one EPSG definitions.

Juso API to Geolocation

Projects geojson from any epsg-defined projection to any other defined epsg-defined projection

Retrieve geographic projection information from an EPSG SRID

Find the geographic projection which best turns a given (X,Y) into an expected (lng, lat).

Transform coordinates from one coordinate system to another.