Awesome

mercator-geographic-converter

Simple tool using the esri/geometry/support/webMercatorUtils class to convert coordinates.

Related documentation:

• Articles / Docs
  • Coordinate Systems: What's the Difference?
  • Spatial references
• Videos
  • Introducing Coordinate Systems and Map Projections
  • Introducing Coordinate Systems and Transformations
• To do more advance conversions check:
  • esri/geometry/projection (projection engine)
  • JSON with Spatial reference WKIDs: Geographic and vertical coordinate system tables (part of @esri/proj-codes)