fastgeojson - High-Performance 'GeoJSON' and 'JSON' Serialization for R

A high-performance 'JSON' encoder implemented in 'Rust'. It provides a universal 'as_json()' function capable of serializing most R objects -- including 'sf' spatial data, data frames, and nested lists. Leveraging a performant 'Rust' backend, it generates compliant 'JSON' strings optimized for direct use in web frameworks like 'Shiny', 'Leaflet', and 'Highcharter'.