How do i access an element of an object that is inside an array and that array is inside an object [duplicate]

I need a small Help in JS? i want to access mail_address of this nested object, how will I do it

const data = 
  { members: 
    [ { id           : '7d8c03e88a8386f6453340c1db56'
      , mail_address : 'trial.om'
      , uniqsl       : 'c6cce01'
  } ] }