app.js

// Initialize the Firebase Admin SDK (replace with your actual initialization)
// For example:
const admin = require("firebase-admin");
const serviceAccount = require("./serviceAccountKey.json");
admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  //databaseURL: 'https://your-database-name.firebaseio.com'
});

// Assuming you have already initialized the Admin SDK and have access to the auth service
const { getAuth } = require("firebase-admin/auth");

// Up to 1000 users can be imported at once.
const userImportRecords = [
  {
    uid: "uid1",
    email: "[email protected]",
    passwordHash: Buffer.from("password-hash"),
  },
  {
    uid: "uid2",
    email: "[email protected]",
    passwordHash: Buffer.from("password-hash"),
  },
  // Add more user records here, up to 1000
];

getAuth()
  .importUsers(userImportRecords, {
    hash: {
      algorithm: "BCRYPT",
    },
  })
  .then((userImportResult) => {
    // The number of successful imports is determined via: userImportResult.successCount.
    // The number of failed imports is determined via: userImportResult.failureCount.
    console.log(
      `Successfully imported ${userImportResult.successCount} users.`
    );
    console.log(`Failed to import ${userImportResult.failureCount} users.`);

    // To get the error details.
    userImportResult.errors.forEach((indexedError) => {
      // The corresponding user that failed to upload.
      console.log(
        "Error " + indexedError.index,
        " failed to import: ",
        indexedError.error
      );
    });
  })
  .catch((error) => {
    // Some unrecoverable error occurred that prevented the operation from running.
    console.error("Error importing users:", error);
  });