Node.js で Cloud Firestore のデータを読む (Read)

#! /usr/bin/node
// ---------------------------------------------------------------
//  firestore_read.js
//
//                  Jan/25/2020
//
// ---------------------------------------------------------------
console.error ("*** 開始 ***")

const admin = require('firebase-admin')
admin.initializeApp({
  credential: admin.credential.applicationDefault()
})

const db = admin.firestore()


db.collection('cities').get()
  .then((snapshot) => {
    snapshot.forEach((doc) => {
//  console.log(doc.id, '=>', doc.data())
    var unit_aa = doc.data()
    var out_str = doc.id + "\t"
    out_str += unit_aa["name"] + "\t"
    out_str += unit_aa["population"] + "\t"
    out_str += unit_aa["date_mod"]
    console.log (out_str)
    })
console.error ("*** 終了 ***")
  })
  .catch((err) => {
    console.log('Error getting documents', err);
  })


// ---------------------------------------------------------------

export NODE_PATH=/usr/lib/node_modules
project_id="project-dec16-2020"
echo $project_id
#
export GOOGLE_CLOUD_PROJECT=$project_id
export GOOGLE_APPLICATION_CREDENTIALS="***.json"
./firestore_read.js

$ node --version
v14.14.0