Seonglae ChoGithub supports GeoJson preview
GeoJSON Types
GeoJSON Tools
Official
Obsolete
https://geojson.org/geojson-spec
geojson objects in mongo
GeoJSON Objects - MongoDB Manual
MongoDB supports the GeoJSON object types listed on this page. To specify GeoJSON data, use an embedded document with: a field named that specifies the GeoJSON object type and a field named coordinates that specifies the object's coordinates. If specifying latitude and longitude coordinates, list the longitude first and then latitude: Valid longitude values are between and , both inclusive.
https://docs.mongodb.com/manual/reference/geojson/
features Json to geojson
Is it possible to convert regular JSON to GeoJSON?
Converting ArcGIS JSON to GeoJSONThere in pure Browser there are 2 ways you can do 1) TERRAFORMER Note: use in node.js and use in browser are different, details see link 2) Esri/arcgis-to-geojson-utils Esri does not provide the bundle.js, so you can NOT use this lib in browser directly As of today, you can not load module in browser.
https://gis.stackexchange.com/questions/73756/is-it-possible-to-convert-regular-json-to-geojson
