How to i retrive specific data from firebase web

json file of firebase is like

{
  "users": {
    "a540678c0fda89f430bfba480ffe6f40146548bad72c199f8536b167fc58455a" : {
      "password" : "2a97516c354b68848cdbd8f54a226a0a55b21ed138e207ad6c5cbb9c00aa5aea",
      "phone" : "+91xxxxxxx",
      "uid" : "demo"
    }
  }
}

how do i get value for password, phone and uid using ref().once().then() syntax