Chrome Needs Storage Access

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Description: Use the chrome.storage API to store, retrieve, and track changes to user data.
Availability: Since Chrome 38.
Permissions: 'storage'
Content Scripts: Fully supported. Learn more
Learn More: Chrome Apps Office Hours: Chrome Storage APIs
Chrome Apps Office Hours: Storage API Deep Dive

Overview

This API has been optimized to meet the specific storage needs of extensions. It provides the same storage capabilities as the localStorage API with the following key differences:

  • User data can be automatically synced with Chrome sync (using storage.sync).
  • Your extension's content scripts can directly access user data without the need for a background page.
  • A user's extension settings can be persisted even when using split incognito behavior.
  • It's asynchronous with bulk read and write operations, and therefore faster than the blocking and serial localStorage API.
  • User data can be stored as objects (the localStorage API stores data in strings).
  • Enterprise policies configured by the administrator for the extension can be read (using storage.managed with a schema).

Manifest

You must declare the 'storage' permission in the extension manifest to use the storage API. For example:

Usage

This content is likely not relevant anymore. Need to access storage to download 0 Recommended Answers 3 Replies 42 Upvotes.

  • This content is likely not relevant anymore. Try searching or browse recent questions. Original Poster-Ishaaq Aboubaker. Get Link Report Abuse. Need to access storage to download 0 Recommended Answers 3 Replies 42 Upvotes Trying to download an image to my Google pixel. It says I need to allow permission to access.
  • These alerts may request access to: Your data on all the websites you visit gives access to read, request or modify data from every page you visit (bank account, Facebook).; Your data on a list of websites gives access to read, request or modify data on pages you visit on a list of specified websites.
  • So, as we all know, the Files by Google app essentially replaced the older Files app. I wasn't sure if I should be putting this on the App incompatibilities megathread, but I will be putting it here for now unless I need to move it.

To store user data for your extension, you can use either storage.sync:

or storage.local:

When using storage.sync, the stored data will automatically be synced to any Chrome browser that the user is logged into, provided the user has sync enabled.

When Chrome is offline, Chrome stores the data locally. The next time the browser is online, Chrome syncs the data. Even if a user disables syncing, storage.sync will still work. In this case, it will behave identically to storage.local.

Confidential user information should not be stored! The storage area isn't encrypted.

The storage.managed storage is read-only.

Storage and throttling limits

chrome.storage is not a big truck. It's a series of tubes. And if you don't understand, those tubes can be filled, and if they are filled when you put your message in, it gets in line, and it's going to be delayed by anyone that puts into that tube enormous amounts of material.

For details on the current limits of the storage API, and what happens when those limits are exceeded, please see the quota information for sync and local.

Examples

The following example checks for CSS code saved by a user on a form, and if found, stores it.

If you're interested in tracking changes made to a data object, you can add a listener to its onChanged event. Whenever anything changes in storage, that event fires. Here's sample code to listen for saved changes:

Summary

Types
StorageChange
StorageArea
Properties
sync
local
managed
Events
onChanged

Types

StorageChange

properties
any(optional) oldValue

The old value of the item, if there was an old value.

any(optional) newValue

The new value of the item, if there is a new value.

StorageArea

onChanged

Since Chrome 73.

Fired when one or more items change.

methods

get

StorageArea.get(string or array of string or object keys, function callback)

Gets one or more items from storage.

Parameters
string or array of string or object(optional) keys

A single key to get, list of keys to get, or a dictionary specifying default values (see description of the object). An empty list or object will return an empty result object. Pass in null to get the entire contents of storage.

function callback

Callback with storage items, or on failure (in which case runtime.lastError will be set).

The callback parameter should be a function that looks like this:

function(object items) {...};
object items

Object with items in their key-value mappings.

getBytesInUse

StorageArea.getBytesInUse(string or array of string keys, function callback)

Gets the amount of space (in bytes) being used by one or more items.

Parameters
string or array of string(optional) keys

A single key or list of keys to get the total usage for. An empty list will return 0. Pass in null to get the total usage of all of storage.

function callback

Callback with the amount of space being used by storage, or on failure (in which case runtime.lastError will be set).

The callback parameter should be a function that looks like this:

function(integer bytesInUse) {...};
integer bytesInUse

Amount of space being used in storage, in bytes.

set

StorageArea.set(object items, function callback)

Sets multiple items.

Parameters
object items

An object which gives each key/value pair to update storage with. Any other key/value pairs in storage will not be affected.

Primitive values such as numbers will serialize as expected. Values with a typeof'object' and 'function' will typically serialize to {}, with the exception of Array (serializes as expected), Date, and Regex (serialize using their String representation).

function(optional) callback

Callback on success, or on failure (in which case runtime.lastError will be set).

If you specify the callback parameter, it should be a function that looks like this:

function() {...};

remove

StorageArea.remove(string or array of string keys, function callback)

Removes one or more items from storage.

Parameters
string or array of string keys

A single key or a list of keys for items to remove.

function(optional) callback

Callback on success, or on failure (in which case runtime.lastError will be set).

If you specify the callback parameter, it should be a function that looks like this:

function() {...};

clear

Removes all items from storage.

Parameters
function(optional) callback

Callback on success, or on failure (in which case runtime.lastError will be set).

If you specify the callback parameter, it should be a function that looks like this:

function() {...};
events

addListener

Parameters
function callback

The callback parameter should be a function that looks like this:

function(object changes) {...};
object changes

Object mapping each key that changed to its corresponding storage.StorageChange for that item.

Properties

StorageAreachrome.storage.sync Items in the sync storage area are synced using Chrome Sync.
Properties
102,400 QUOTA_BYTES

The maximum total amount (in bytes) of data that can be stored in sync storage, as measured by the JSON stringification of every value plus every key's length. Updates that would cause this limit to be exceeded fail immediately and set runtime.lastError.

8,192 QUOTA_BYTES_PER_ITEM

The maximum size (in bytes) of each individual item in sync storage, as measured by the JSON stringification of its value plus its key length. Updates containing items larger than this limit will fail immediately and set runtime.lastError.

512 MAX_ITEMS

The maximum number of items that can be stored in sync storage. Updates that would cause this limit to be exceeded will fail immediately and set runtime.lastError.

1,800 MAX_WRITE_OPERATIONS_PER_HOUR

The maximum number of set, remove, or clear operations that can be performed each hour. This is 1 every 2 seconds, a lower ceiling than the short term higher writes-per-minute limit.

Updates that would cause this limit to be exceeded fail immediately and set runtime.lastError.

120 MAX_WRITE_OPERATIONS_PER_MINUTE

Since Chrome 40.

The maximum number of set, remove, or clear operations that can be performed each minute. This is 2 per second, providing higher throughput than writes-per-hour over a shorter period of time.

Updates that would cause this limit to be exceeded fail immediately and set runtime.lastError.

1,000,000 MAX_SUSTAINED_WRITE_OPERATIONS_PER_MINUTE

Deprecated since Chrome 40. The storage.sync API no longer has a sustained write operation quota.

StorageAreachrome.storage.local Items in the local storage area are local to each machine.
Properties
5,242,880 QUOTA_BYTES

The maximum amount (in bytes) of data that can be stored in local storage, as measured by the JSON stringification of every value plus every key's length. This value will be ignored if the extension has the unlimitedStorage permission. Updates that would cause this limit to be exceeded fail immediately and set runtime.lastError.

StorageAreachrome.storage.managed Items in the managed storage area are set by the domain administrator, and are read-only for the extension; trying to modify this namespace results in an error.

Events

onChanged

Fired when one or more items change.

addListener

chrome.storage.onChanged.addListener(function callback)
Parameters
function callback

The callback parameter should be a function that looks like this:

function(object changes, string areaName) {...};
object changes

Object mapping each key that changed to its corresponding storage.StorageChange for that item.

string areaName

The name of the storage area ('sync', 'local' or 'managed') the changes are for.

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