describe.js

map.describe_data()

{ world: 
   { type: 'vector',
     extent: 
      [ -20037508.342789248,
        -8283343.693882697,
        20037508.342789244,
        18365151.363070473 ],
     encoding: 'utf-8',
     fields: 
      { FIPS: 'String',
        ISO2: 'String',
        ISO3: 'String',
        UN: 'Number',
        NAME: 'String',
        AREA: 'Number',
        POP2005: 'Number',
        REGION: 'Number',
        SUBREGION: 'Number',
        LON: 'Number',
        LAT: 'Number' } } }