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Google Cloud Bucket is a node.js package to manage Google Cloud Buckets and its objects. All read APIs uses an exponential backoff retry strategy in cases of errors. By default, that strategy times out after 10 seconds, but it can be configured.

Table of Contents

Install

npm i google-cloud-bucket --save

Getting started

Prerequisite

Before using this package, you must first:

  1. Have a Google Cloud Account.
  2. Have a Service Account set up with the following three roles:
    • roles/storage.objectCreator
    • roles/storage.objectAdmin (only if you want to update access to object or create/delete buckets)
    • roles/storage.admin (only if you want to update access to an entire bucket)
  3. Get the JSON keys file for that Service Account above, or set up an environment with the appropriate service identity (more about this in the 4 ways to create a client section).
  4. If you're using a service account JSON key file, then save that JSON key into a service-account.json file (make sure it is located under a path that is accessible to your app), or save the following properties to either manually set up the client or set up environment variables:
    • project_id
    • client_email
    • private_key

Basics

const { join } = require('path')
const { client } = require('google-cloud-bucket')

// This is one of the many options to create a storage client. To see all the different
// way to create a client, please refer to the '4 ways to create a client' section.
const storage = client.new({ 
	jsonKeyFile: join(__dirname, './service-account.json') 
})

// LISTING ALL THE BUCKETS IN THAT PROJECT 
storage.list().then(console.log)

const someObject = {
	firstname: 'Nicolas',
	lastname: 'Dao',
	company: 'Neap Pty Ltd',
	city: 'Sydney'
}

// CREATING A BUCKET (This method will fail if your bucket name is not globally unique. You also need to the role 'roles/storage.objectAdmin')
storage.bucket('your-globally-unique-bucket-name').create()
	.then(data => console.log(data))

// CREATING A BUCKET IN SPECIFIC LOCATION (default is US. A detailed list of all the locations can be found in the Annexes of this document)
storage.bucket('your-globally-unique-bucket-name').create({ location: 'australia-southeast1' })
	.then(data => console.log(data))

// DELETING A BUCKET
storage.bucket('your-globally-unique-bucket-name').delete({ force:true })
	.then(data => console.log(data))

// GET A BUCKET'S SETUP DATA 
storage.bucket('your-globally-unique-bucket-name').get()
	.then(data => console.log(data))

// ADDING AN OBJECT
storage.insert(someObject, 'your-bucket/a-path/filename.json') // insert an object into a bucket 'a-path/filename.json' does not need to exist
	.then(() => storage.get('your-bucket/a-path/filename.json')) // retrieve that new object
	.then(res => console.log(JSON.stringify(res, null, ' ')))

// ADDING A HTML PAGE WITH PUBLIC ACCESS (warning: Your service account must have the 'roles/storage.objectAdmin' role)
const html = `
<!doctype html>
<html>
	<body>
		<h1>Hello Giiiiirls</h1>
	</body>
</html>`

storage.insert(html, 'your-bucket/a-path/index.html') 

// UPLOADING AN IMAGE (we assume we have access to an image as a buffer variable called 'imgBuffer')
storage.insert(imgBuffer, 'your-bucket/a-path/image.jpg') 

// GETTING BACK THE OBJECT
storage.get('your-bucket/a-path/filename.json').then(obj => console.log(obj))

// GETTING THE HTML BACK
storage.get('your-bucket/a-path/index.html').then(htmlString => console.log(htmlString))

// GETTING BACK THE IMAGE
// USE CASE 1 - Loading the entire buffer in memory
storage.get('your-bucket/a-path/image.jpg').then(imgBuffer => console.log(imgBuffer))

// USE CASE 2 - Loading the image on your filesystem
storage.get('your-bucket/a-path/image.jpg', { dst: 'some-path/image.jpg' })
	.then(() => console.log(`Image successfully downloaded.`))

// USE CASE 3 - Piping the image buffer into a custom stream reader
const { Writable } = require('stream')
const customReader = new Writable({
	write(chunk, encoding, callback) {
		console.log('Hello chunk of image')
		callback()
	}
})
storage.get('your-bucket/a-path/image.jpg', { streamReader: customReader })
	.then(() => console.log(`Image successfully downloaded.`))

// TESTING IF A FILE OR A BUCKET EXISTS
storage.exists('your-bucket/a-path/image.jpg')
	.then(fileExists => fileExists ? console.log('File exists.') : console.log('File does not exist.'))

// LISTING ALL THE FILES METADATA WITH A FILEPATH THAT STARTS WITH SPECIFIC NAME
storage.list('your-bucket/a-path/')
	.then(files => console.log(files))

Bucket API

The examples above demonstrate how to insert and query any storage. We've also included a variant of those APIs that are more focused on the bucket:

// THIS API:
storage.insert(someObject, 'your-bucket/a-path/filename.json')
// CAN BE REWRITTEN AS FOLLOW:
storage.bucket('your-bucket').object('a-path/filename.json').insert(someObject)

// THIS API:
storage.get('your-bucket/a-path/filename.json').then(obj => console.log(obj))
// CAN BE REWRITTEN AS FOLLOW:
storage.bucket('your-bucket').object('a-path/filename.json').get().then(obj => console.log(obj))

// THIS API:
storage.exists('your-bucket/a-path/image.jpg')
	.then(fileExists => fileExists ? console.log('File exists.') : console.log('File does not exist.'))
// CAN BE REWRITTEN AS FOLLOW:
storage.bucket('your-bucket').object('a-path/image.jpg').exists()
	.then(fileExists => fileExists ? console.log('File exists.') : console.log('File does not exist.'))

// THIS API:
storage.list('your-bucket/a-path/')
	.then(files => console.log(files))
// CAN BE REWRITTEN AS FOLLOW:
storage.bucket('your-bucket').object('a-path/').list()
	.then(files => console.log(files))

Configuring your bucket or your file

Publicly Readable Config

This allows to make any files publicly readable by anybody on the web. That's usefull if you want to host a website, or publish data (e.g., RSS feed).

Once your bucket is publicly readable, everyone can access it at this url: https://storage.googleapis.com/your-bucket/some-path/index.html

WARNING: If that bucket hosts files that hsould be accessible cross domain (e.g., an RSS feed), don't forget to also set up CORS (next section Configuring CORS On a Bucket).

const bucket = storage.bucket('your-bucket')

// TEST WHETHER A BUCKET IS PUBLIC OR NOT
bucket.isPublic().then(isPublic => isPublic ? console.log(`Bucket '${bucket.name}' is public`) : console.log(`Bucket '${bucket.name}' is not public`))

// MAKING A BUCKET PUBLICLY READABLE (warning: Your service account must have the 'roles/storage.admin' role)
// Once a bucket is public, all content added to it (even when omitting the 'public' flag) is public
bucket.addPublicAccess()
	.then(({ publicUri }) => console.log(`Your web page is publicly available at: ${publicUri}`)) 

// REMOVING THE PUBLICLY READABLE ACCESS FROM A BUCKET (warning: Your service account must have the 'roles/storage.admin' role)
bucket.removePublicAccess()

// MAKING AN EXISTING OBJECT PUBLICLY READABLE (warning: Your service account must have the 'roles/storage.objectAdmin' role)
bucket.object('a-path/private.html').addPublicAccess()
	.then(({ publicUri }) => console.log(`Your web page is publicly available at: ${publicUri}`)) 

// REMOVING THE PUBLICLY READABLE ACCESS FROM A FILE  (warning: Your service account must have the 'roles/storage.objectAdmin' role)
bucket.object('a-path/private.html').removePublicAccess()

Making A Single File Publicly Readable At Creation Time

It is also possible to make a single file publicly readable in a single command when the file is created:

storage.insert(html, 'your-bucket/a-path/index.html', { public: true }) 
	.then(({ publicUri }) => console.log(`Your web page is publicly available at: ${publicUri}`)) 

Once your file is publicly readable, everyone can access it at this url: https://storage.googleapis.com/your-bucket/a-path/index.html

WARNING: If that bucket hosts files that hsould be accessible cross domain (e.g., an RSS feed), don't forget to also set up CORS (next section Configuring CORS On a Bucket).

Setting Single File Content Encoding At Creation Time

It is also possible to set a file's content encoding in a single command when the file is created:

storage.insert(html, 'your-bucket/a-path/index.html', { contentEncoding: 'gzip' })
	.then(({ publicUri }) => console.log(`Your gzipped file is available at: ${publicUri}`))

Configuring CORS On a Bucket

If your files are publicly readable on the web, they might not be accessible when referenced from other websites. To enable other websites to access your files, you will have to configure CORS on your bucket:

// CONFIGURE CORS ON A BUCKET (warning: Your service account must have the 'roles/storage.admin' role)
bucket.cors.setup({
	origin: ['*'],
	method: ['GET', 'OPTIONS', 'HEAD', 'POST'],
	responseHeader: ['Authorization', 'Origin', 'X-Requested-With', 'Content-Type', 'Accept'],
	maxAgeSeconds: 3600
})
.then(() => console.log(`CORS successfully set up on your bucket.`))

If you want to check if CORS has already been set up on a bucket:

bucket.cors.exists().then(yes => yes 
	? console.log(`CORS already set up on bucket '${bucket.name}'.`)
	: console.log(`CORS not set up yet on bucket '${bucket.name}'.`))

You can also check if a specific CORS config exists:

bucket.cors.exists({
	origin: ['*'],
	method: ['GET', 'OPTIONS', 'HEAD', 'POST'],
	responseHeader: ['Authorization', 'Origin', 'X-Requested-With', 'Content-Type', 'Accept'],
	maxAgeSeconds: 3600
}).then(yes => yes 
	? console.log(`CORS already set up on bucket '${bucket.name}'.`)
	: console.log(`CORS not set up yet on bucket '${bucket.name}'.`))

To remove CORS from a bucket:

bucket.cors.disable().then(() => console.log(`CORS successfully disabled on bucket '${bucket.name}'.`))

Configuring A Bucket As A Static Website

To achieve this you need to setup 5 things:

  1. You need to setup the service account that you've been using to manage your bucket (defined in your service-account.json) as a domain owner. To achieve that, the first step is to prove your ownership using https://search.google.com/search-console/welcome. When that's done, open the settings and select User and permissions. There, you'll be able to add a new owner, which will allow you to add the email of your service account.

  2. Create a bucket with a name matching your domain (e.g., www.your-domain-name.com)

  3. Make that bucket public. Refer to section Publicly Readable Config above.

  4. Add a new CNAME record in your DNS similar to this:

    TypeNameValue
    CNAMEwwwc.storage.googleapis.com
  5. Configure the bucket so that each index.html and the 404.html page are the default pages (otherwise, you'll have to explicitly enter http://www.your-domain-name.com/index.html to reach your website instead of simply entering http://www.your-domain-name.com):

bucket.website.setup({
	mainPageSuffix: 'index.html',
	notFoundPage: '404.html'
}).then(console.log)

Zipping files

const bucket = storage.bucket('your-bucket-name')

bucket.object('some-folder-path').zip({ 
	to: {
		local: 'some-path-on-your-local-machine',
		bucket: {
			name: 'another-existing-bucket-name', 	// Optional (default: Source bucket. In our example, that source bucket is 'your-bucket-name')
			path: 'some-folder-path.zip' 			// Optional (default: 'archive.zip'). If specified, must have the '.zip' extension.
		}
	}, 
	ignore:[/\.png$/, /\.jpg$/, /\.html$/] // Optional. Array of strings or regex
})
.then(({ count, data }) => {
	console.log(`${count} files have been zipped`)
	if (data) 
		// 'data' is null if the 'options.to' is defined
		console.log(`The zip file's size is: ${data.length/1024} KB`)
})

Extra Options

You can also track the various steps of the zipping process with the optional on object:

const bucket = storage.bucket('your-bucket-name')

bucket.object('some-folder-path').zip({ 
	to: {
		local: 'some-path-on-your-local-machine',
		bucket: {
			name: 'another-existing-bucket-name', 	// Optional (default: Source bucket. In our example, that source bucket is 'your-bucket-name')
			path: 'some-folder-path.zip' 			// Optional (default: 'archive.zip'). If specified, must have the '.zip' extension.
		}
	}, 
	on:{
		'files-listed': (files) => {
			console.log(`Total number of files to be zipped: ${files.count}`)
			console.log(`Raw size: ${(files.size/1024/1024).toFixed(1)} MB`)
			// 'files.data' is an array of all the files' details
		},
		'file-received': ({ file, size }) => {
			console.log(`File ${file} (byte size: ${size}) is being zipped`)
		},
		'finished': ({ size }) => {
			console.log(`Zip process completed. The zip file's size is ${size} bytes`)
		},
		'saved': () => {
			console.log('The zipped file has been saved')
		},
		'error': err => {
			console.log(`${err.message}\n${err.stack}`)
		}
	}
})
.then(({ count, data }) => {
	console.log(`${count} files have been zipped`)
	if (data) 
		// 'data' is null if the 'options.to' is defined
		console.log(`The zip file's size is: ${data.length/1024} KB`)
})

Four ways to create a client

This library supports four different ways to create a client. The first method is the recommended way:

  1. User the hosting identity
  2. Using a service-account.json
  3. Using explicit credentials
  4. Using environment variables

User the hosting identity

const { client } = require('google-cloud-bucket')

const storage = client.new()

In this case, the package fetches the credentials automatically. It will try three different techniques to get those data, and if none of them work, an error is thrown. Those techniques are:

  1. If the code is hosted on GCP (e.g., Cloud Compute, App Engine, Cloud Function or Cloud Run) then the credentials are extracted from the service account associated with the GCP service.
  2. If the GOOGLE_APPLICATION_CREDENTIALS environment variable exists, its value is supposed to be the path to a service account JSON key file on the hosting machine.
  3. If the ~/.config/gcloud/application_default_credentials.json file exists, then the credentials it contains are used (more about setting that file up below).

When developing on your local environment, use either #2 or #3. #3 is equivalent to being invited by the SysAdmin to the project and granted specific privileges. To set up ~/.config/gcloud/application_default_credentials.json, follow those steps:

Using a service-account.json

We assume that you have created a Service Account in your Google Cloud Account (using IAM) and that you've downloaded a service-account.json (the name of the file does not matter as long as it is a valid json file). The first way to create a client is to provide the path to that service-account.json as shown in the following example:

const { join } = require('path')
const { client } = require('google-cloud-bucket')

const storage = client.new({ 
	jsonKeyFile: join(__dirname, './service-account.json') 
})

Using explicit credentials

This method is similar to the previous one. You should have dowloaded a service-account.json, but instead of providing its path, you provide some of its details explicitly:

const { client } = require('google-cloud-bucket')

const storage = client.new({ 
	credentials: {
		project_id: 'your-project-id', 
		client_email:'something-1234@your-project-id.iam.gserviceaccount.com', 
		private_key: '-----BEGIN PRIVATE KEY-----\n123456789-----END PRIVATE KEY-----\n'
	}
})

Using environment variables

const { client } = require('google-cloud-bucket')

const storage = client.new()

The above will only work if all the following environment variables are set:

WARNING: If you're using NPM's dotenv, wrap your PRIVATE_KEY between double-quotes, otherwise some characters are escaped which corrupts the key.

Refer to the next section to see how to pass an OAuth2 token.

Extra Precautions To Make Robust Queries

Avoiding Network Errors

Networks errors (e.g. socket hang up, connect ECONNREFUSED) are a fact of life. To deal with those undeterministic errors, this library uses a simple exponential back off retry strategy, which will reprocess your read or write request for 10 seconds by default. You can increase that retry period as follow:

// Retry timeout for CHECKING FILE EXISTS
storage.exists('your-bucket/a-path/image.jpg', { timeout: 30000 }) // 30 seconds retry period timeout

// Retry timeout for INSERTS
storage.insert(someObject, 'your-bucket/a-path/filename.json', { timeout: 30000 }) // 30 seconds retry period timeout

// Retry timeout for QUERIES
storage.get('your-bucket/a-path/filename.json', { timeout: 30000 }) // 30 seconds retry period timeout

Using An External OAuth2 Token

If you've used the 3rd method to create a client (i.e. 3. Using a ProjectId), then all the method you use require an explicit OAuth2 token:

storage.list({ token }).then(console.log)

All method accept a last optional argument object.

Performance Tips

The Google Cloud Storage API supports partial response. This allows to only return specific fields rather than all of them, which can improve performances if you're querying a lot of objects. The only method that currently supports partial response is the the list API.

storage.bucket('your-bucket').object('a-folder/').list({ fields:['name'] })

The above example only returns the name field. The full list of supported fields is detailed under bucketObject.list([options]) section.

Full API Doc

Storage API

To create the storage object, please refer to the previous section 3 ways to create a client.

This object allows to perform most read/write operations. It uses a string representing the path to where the objects or folders are. If using path is the stragegy you decide to employ to manage objects, then the Storage API is the way to go. If, on the contrary, you need to reason based on a specific bucket or a specific object, then it is recommended to use the Bucket API or the BucketObject API.

storage.get(filePath[, options]): <Promise<GoogleBucketObject>>

storage.get('your-bucket-name/path-to-file/your-file.css').then(console.log)

This writes a CSS content to the output.

Gets an object located under the bucket's filePath path.

storage.list([options]) or storage.list(filePath[, options]): <Promise<Array<GoogleBucketBase|GoogleBucketObject>>>

storage.list('your-bucket-name/path-to-file').then(console.log)

This writes an array of object describing all the files under that path to the output.

Lists buckets for this project or objects under a specific filePath.

storage.insert(object, filePath[, options]): <Promise<GoogleBucketObjectPlus>>

storage.insert({ hello:'world' }, 'your-bucket-name/path-to-file/sample.json').then(console.log)

Inserts a new object to filePath.

NOTE: The content type of each object request is automatically determined by the file's URL. However, there are scenarios where the extension is unknown or the content type must be overidden. In that case, use the option as follow: { headers: { 'Content-Type': 'application/json' } }.

storage.insertFile(localPath, filePath[, options]): <Promise<GoogleBucketObjectPlus>>

storage.insertFile('/Users/you/your-file.jpg', 'your-bucket-name/path-to-file/your-file.jpg').then(console.log)

Inserts a file located at localPath to filePath.

NOTE: The content type of each object request is automatically determined by the file's URL. However, there are scenarios where the extension is unknown or the content type must be overidden. In that case, use the option as follow: { headers: { 'Content-Type': 'application/json' } }.

storage.exists(filePath[, options]): <Promise<Boolean>>

Checks whether an object located under the filePath path exists or not.

storage.addPublicAccess(filePath[, options]): <Promise<Object>>

Grants public access to a file located under the filePath path.

storage.removePublicAccess(filePath[, options]): <Promise<Object>>

Removes public access from a file located under the filePath path.

storage.bucket(bucketId): <Bucket>

Gets a bucket object. This object exposes a series of APIs described under the bucket API section below.

Bucket API

The bucket object is created using a code snippet similar to the following:

const bucket = storage.bucket('your-bucket-id')

bucket.name: <String>

Gets the bucket's name

bucket.get([options]): <Promise<Object>>

Gets a bucket's metadata object.

bucket.exists([options]): <Promise<Boolean>>

Checks if a bucket exists.

bucket.create([options]): <Promise<Object>>

Creates a new bucket.

WARNING: A bucket's name must follow clear guidelines (more details in the Annexes under the Bucket Name Restrictions section). To facilitate the buckets name validation, a mathod called validate.bucketName is provided:

const { utils:{ validate } } = require('google-cloud-bucket')
const validate.bucketName('hello') 	// => { valid:true, reason:null }
validate.bucketName('hello.com') 	// => { valid:true, reason:null }
validate.bucketName('he_llo-23') 	// => { valid:true, reason:null }
validate.bucketName('_hello') 		// => { valid:false, reason:'The bucket name must start and end with a number or letter.' }
validate.bucketName('hEllo') 		// => { valid:false, reason:'The bucket name must contain only lowercase letters, numbers, dashes (-), underscores (_), and dots (.).' }
validate.bucketName('192.168.5.4') 	// => { valid:false, reason:'The bucket name cannot be represented as an IP address in dotted-decimal notation (for example, 192.168.5.4).' }
validate.bucketName('googletest') 	// => { valid:false, reason:'The bucket name cannot begin with the "goog" prefix or contain close misspellings, such as "g00gle".' }

bucket.delete([options]): <Promise<Object>>

Deletes a bucket.

bucket.update(config,[options]): <Promise<Object>>

Updates a bucket.

bucket.addPublicAccess([options]): <Promise<Object>>

Grants public access to a bucket as well as all its files.

bucket.removePublicAccess([options]): <Promise<Object>>

Removes public access from a bucket as well as all its files.

bucket.isPublic([options]): <Promise<Boolean>>

Checks if a bucket is public or not.

bucket.zip([options]): <Promise<Object>>

Zips bucket.

bucket.cors.get([options]): <Promise<GoogleBucketCORS>>

Get's the bucket's CORS setup.

bucket.cors.exists(corsConfig, [options]): <Promise<Boolean>>

Checks if a bucket has been configured with specific CORS setup.

bucket.cors.setup(corsConfig, [options]): <Promise<Object>>

Configures a bucket with a specific CORS setup.

bucket.cors.update({ add: addConfig, remove: delConfig }): <Promise<GoogleBucketCORS>>

WARNING: A CORS config must exist prior to calling this API, otherwise, an error is thrown.

bucket.cors.update({ add:{ responseHeader:['Accept'] }, remove:{ responseHeader:['Authorize'] } })

bucket.cors.disable([options]): <Promise<Object>>

Removes any CORS setup from a bucket.

bucket.website.setup(webConfig, [options]): <Promise<Object>>

Configures a bucket with a specific website setup.

NOTE: This API does not change the bucket access state. You should make this bucket public first using the bucket.addPublicAccess API described above.

bucket.object(filePath): <BucketObject>

Gets a bucket's object reference. This object exposes a series of APIs detailed in the next section BucketObject API.

BucketObject API

The bucketObject object is created using a code snippet similar to the following:

const bucket = storage.bucket('your-bucket-id')
const bucketObject = bucket.object('folder1/folder2/index.html')

An bucket object can also be a folder:

const bucketFolder = bucket.object('folder1/folder2')

bucketObject.file: <String>

console.log(bucketObject.file)

Gets bucketObject file name.

bucketObject.get([options]): <Promise<<Object>>

WARNING: Only works if the object is a file. Will not work for folder.

bucketObject.get().then(console.log)

Gets the bucket object.

bucketObject.getInfo([options]): <Promise<Object>>

WARNING: Only works if the object is a file. Will not work for folder.

bucketObject.getInfo().then(console.log)

Gets the file's metadata.

bucketObject.list([options]): <Promise<<Array<Object>>>

Lists all the objects' metadata located under the bucket object if that bucket object is a folder. If the object is a file, the response is a single object array where the only object represents the file's metadata.

bucketObject.exists([options]): <Promise<Boolean>>

Checks if a bucket object exists or not.

bucketObject.insert(object[, options]): <Promise<GoogleBucketObjectPlus>>

Inserts a new object to that bucket object.

NOTE: The content type of each object request is automatically determined by the file's URL. However, there are scenarios where the extension is unknown or the content type must be overidden. In that case, use the option as follow: { headers: { 'Content-Type': 'application/json' } }.

bucketObject.insertFile(localPath[, options]): <Promise<GoogleBucketObjectPlus>>

Inserts a file located at localPath to that bucket object.

NOTE: The content type of each object request is automatically determined by the file's URL. However, there are scenarios where the extension is unknown or the content type must be overidden. In that case, use the option as follow: { headers: { 'Content-Type': 'application/json' } }.

bucketObject.delete([options]): <Promise<Object>>

Deletes an object or an entire folder.

NOTE: To delete a folder, the argument used to create the bucketObject must be a folder (e.g., storage.bucket('your-bucket-id').object('folderA/folderB').delete())

bucketObject.zip([options]): <Promise<Object>>

Lists all the objects located under the bucket object (if that bucket object is a folder).

bucketObject.addPublicAccess([options]): <Promise<Object>>

Grants public access to a bucket object.

bucketObject.removePublicAccess([options]): <Promise<Object>>

Removes public access from a bucket object.

bucketObject.headers.update(headers): <Promise<GoogleBucketBase>>

WARNING: Only works if the object is a file. Will not work for folder.

bucketObject.headers.update({ cacheControl:'public, max-age=3600', 'X-Content-Type-Options':'nosniff' })

Adds or remove headers on the object.

bucketObject.removeHeaders(object): <Promise<Object>>

WARNING: Only works if the object is a file. Will not work for folder.

Objects

GoogleBucketBase

GoogleBucketFull

Same as GoogleBucketBase with an extra property:

GoogleBucketWebsite

GoogleBucketCORS

GoogleBucketIAM

GoogleBucketBindings

GoogleBucketObject

GoogleBucketObjectPlus

Same as GoogleBucketObject, but with the following extra property:

Annexes

Bucket Name Restrictions

Follow those rules to choose a bucket's name (those rules were extracted from the official Google Cloud Storage documentation):

To help validate if a name follows those rules, this package provides a utility method called validate.bucketName:

const { utils:{ validate } } = require('google-cloud-bucket')
const validate.bucketName('hello') 	// => { valid:true, reason:null }
validate.bucketName('hello.com') 	// => { valid:true, reason:null }
validate.bucketName('he_llo-23') 	// => { valid:true, reason:null }
validate.bucketName('_hello') 		// => { valid:false, reason:'The bucket name must start and end with a number or letter.' }
validate.bucketName('hEllo') 		// => { valid:false, reason:'The bucket name must contain only lowercase letters, numbers, dashes (-), underscores (_), and dots (.).' }
validate.bucketName('192.168.5.4') 	// => { valid:false, reason:'The bucket name cannot be represented as an IP address in dotted-decimal notation (for example, 192.168.5.4).' }
validate.bucketName('googletest') 	// => { valid:false, reason:'The bucket name cannot begin with the "goog" prefix or contain close misspellings, such as "g00gle".' }

List Of All Google Cloud Platform Locations

Single Regions

Single reagions are bucket locations that indicate that your data are replicated in multiple servers in that single region. Though it is unlikely that you would loose your data because all servers fail, it is however possible that a network failure brings that region inaccessbile. At this stage, your data would not be lost, but they would be unavailable for the period of that network outage. This type of storage is the cheapest.

Use this type of location if your data:

If the above limits are too strict for your use case, then you should probably use a Multi Regions.

LocationDescription
northamerica-northeast1Canada - Montréal
us-central1US - Iowa
us-east1US - South Carolina
us-east4US - Northern Virginia
us-west1US - Oregon
us-west2US - Los Angeles
southamerica-east1South America - Brazil
europe-north1Europe - Finland
europe-west1Europe - Belgium
europe-west2Europe - England
europe-west3Europe - Germany
europe-west4Europe - Netherlands
asia-east1Asia - Taiwan
asia-east2Asia - Hong Kong
asia-northeast1Asia - Japan
asia-south1Asia - Mumbai
asia-southeast1Asia - Singapore
australia-southeast1Asia - Australia
asiaAsia
usUS
euEurope

Multi Regions

Multi regions are bucket locations where your data are not only replicated in multiple servers in the same regions, but also replicated across multiple locations (e.g., asia will replicate your data across Taiwan, Hong Kong, Japan, Mumbai, Singapore, Australia). That means that your data are:

LocationDescription
asiaAsia
usUS
euEurope

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