How to get the file size of a Google Cloud Storage object in JavaScript

index.js

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const bucketName = 'Name of a bucket, e.g. my-bucket';
// const filename = 'File to access, e.g. file.txt';

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();

async function getMetadata() {
  // Gets the metadata for the file
  const [metadata] = await storage
    .bucket(bucketName)
    .file(filename)
    .getMetadata();

  console.log(`File: ${metadata.name}`);
  console.log(`Bucket: ${metadata.bucket}`);
  console.log(`Storage class: ${metadata.storageClass}`);
  console.log(`Self link: ${metadata.selfLink}`);
  console.log(`ID: ${metadata.id}`);
  console.log(`Size: ${metadata.size}`);
  console.log(`Updated: ${metadata.updated}`);
  console.log(`Generation: ${metadata.generation}`);
  console.log(`Metageneration: ${metadata.metageneration}`);
  console.log(`Etag: ${metadata.etag}`);
  console.log(`Owner: ${metadata.owner}`);
  console.log(`Component count: ${metadata.component_count}`);
  console.log(`Crc32c: ${metadata.crc32c}`);
  console.log(`md5Hash: ${metadata.md5Hash}`);
  console.log(`Cache-control: ${metadata.cacheControl}`);
  console.log(`Content-type: ${metadata.contentType}`);
  console.log(`Content-disposition: ${metadata.contentDisposition}`);
  console.log(`Content-encoding: ${metadata.contentEncoding}`);
  console.log(`Content-language: ${metadata.contentLanguage}`);
  console.log(`Media link: ${metadata.mediaLink}`);
  console.log(`KMS Key Name: ${metadata.kmsKeyName}`);
  console.log(`Temporary Hold: ${metadata.temporaryHold}`);
  console.log(`Event-based hold: ${metadata.eventBasedHold}`);
  console.log(
    `Effective Expiration Time: ${metadata.effectiveExpirationTime}`
  );
  console.log(`Metadata: ${metadata.metadata}`);
}

getMetadata().catch(console.error);