Nodejs Firebase Storage Sample

app.js

const express = require('express');
const app = express();
const googleStorage = require('@google-cloud/storage');
const Multer = require('multer');

const storage = googleStorage({
  projectId: "<Firebase Project ID",
  keyFilename: "<path to service accounts prviate key JSON>"
});

const bucket = storage.bucket("<Firebase Storage Bucket URL");

const multer = Multer({
  storage: Multer.memoryStorage(),
  limits: {
    fileSize: 5 * 1024 * 1024 // no larger than 5mb, you can change as needed.
  }
});

app.listen(3000, () => {
  console.log('App listening to port 3000');
});

/**
 * Adding new file to the storage
 */
app.post('/upload', multer.single('file'), (req, res) => {
  console.log('Upload Image');

  let file = req.file;
  if (file) {
    uploadImageToStorage(file).then((success) => {
      res.status(200).send({
        status: 'success'
      });
    }).catch((error) => {
      console.error(error);
    });
  }
});

/**
 * Upload the image file to Google Storage
 * @param {File} file object that will be uploaded to Google Storage
 */
const uploadImageToStorage = (file) => {
  return new Promise((resolve, reject) => {
    if (!file) {
      reject('No image file');
    }
    let newFileName = `${file.originalname}_${Date.now()}`;

    let fileUpload = bucket.file(newFileName);

    const blobStream = fileUpload.createWriteStream({
      metadata: {
        contentType: file.mimetype
      }
    });

    blobStream.on('error', (error) => {
      reject('Something is wrong! Unable to upload at the moment.');
    });

    blobStream.on('finish', () => {
      // The public URL can be used to directly access the file via HTTP.
      const url = format(`https://storage.googleapis.com/${bucket.name}/${fileUpload.name}`);
      resolve(url);
    });

    blobStream.end(file.buffer);
  });
}

Something is wrong! Unable to upload at the moment.ReferenceError: format is not defined

fi-sm: You shoud import const {format} = require('util');

what does blobstream do?

blobstream is a variable that contains the stream of the blob data of your file... blobstream "mount" or "transform" blob data in your file....

See https://developer.mozilla.org/pt-BR/docs/Web/API/Streams_API

The picture I upload to firebase is successful, but it can not loading, and when I connect to the picture link, it said:

AccessDenied
Access denied.

Anonymous caller does not have storage.objects.get access to the Google Cloud Storage object.

How can I fix this

The picture I upload to firebase is successful, but it can not loading, and when I connect to the picture link, it said: AccessDenied Access denied.

Anonymous caller does not have storage.objects.get access to the Google Cloud Storage object.
How can I fix this

You may modify the url value to something like this for an expirable public url
const url = fileUpload.getSignedUrl({ action: "read", expires: "02-02-2025", });