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JavaScript

var a = [ { HEDGz2aafs2UdSvT3S: 
     { _id: 'HEDGz2aafs2UdSvT3S',
       batch: '2017-user-created-by-websocket',
       creationIP: 'None',
       creationDate: '2018-06-14T13:23:58.786Z',
       state: [Object],
    },
    M101KSi360g7cER8D5: 
     { _id: 'M101KSi360g7cER8D5',
       batch: '2017-box-created-by-websocket',
       creationIP: 'None',
       creationDate: '2018-06-14T13:24:31.145Z',
       state: [Object],
      } } ]
      
console.log(a.map(x => Object.keys(x).map(y => x[y]._id)))