use-chrome-storage

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☝️ This package is for usage in Chrome Extensions. Should work with Firefox extensions but not tested.

Custom React hooks for chrome.storage. You may use it for keeping global persisted state in Chrome Extensions.

Note: Since it's a React hook, it may be used only in the React context. So it's impossible to use this package in the background service worker.

• Simplify work with chrome.storage
• Supports chrome.storage.local, chrome.storage.sync, and chrome.storage.session
• May be used as persisted state available in different extension's contexts (content script, popup, options page)
• Listen for chrome.storage changes and keep local state updated

Install

npm i use-chrome-storage

Usage

This package requires the storage permission in manifest.json:

{
    "name": "My Extension",
    "permissions": [
        "storage"
    ]
}

For usage with chrome.storage.local use useChromeStorageLocal hook. For chrome.storage.sync use useChromeStorageSync hook.

Usage of useChromeStorage

import React from 'react';
import {useChromeStorageLocal} from 'use-chrome-storage';


const LocalCounter = () => {
    // if you need to state be preserved in `chrome.storage.sync` use useChromeStorageSync
    // for `chrome.storage.session` use useChromeStorageSession
    const [value, setValue, isPersistent, error, isInitialStateResolved] = useChromeStorageLocal('counterLocal', 0);
    return (
            <div>
                <button
                        onClick={() => {
                            setValue(prev => (prev + 1));
                        }}
                >
                    Increment in Local Storage
                </button>
                <div>Value: {value}</div>
                <div>Persisted in chrome.storage.local: {isPersistent.toString()}</div>
                <div>Error: {error}</div>
                <div>Is state from chrome.storage already loaded? - {isInitialStateResolved.toString()}</div>
            </div>
    );
};

Usage of createChromeStorageStateHook

If you want to use same key in different components in different extension parts in React context (like in PopUp, content scripts, ) you need to use createChromeStorageStateHookLocal(for chrome.storage.local), createChromeStorageStateHookSync (for chrome.storage.sync) and createChromeStorageStateHookSession (for chrome.storage.session).

Initialize storage:

// common/useSettingsStore.js
import {createChromeStorageStateHookLocal} from 'use-chrome-storage';


const SETTINGS_KEY = 'settings';
const INITIAL_VALUE = {
    showAvatar: true,
    showHistory: false,
};

export const useSettingsStore = createChromeStorageStateHookLocal(SETTINGS_KEY, INITIAL_VALUE);

Use useSettingsStore on options page:

// options.js
import React from 'react';
import {useSettingsStore} from './common/useSettingsStore';


const Options = () => {
    const [settings, setSettings, isPersistent, error, isInitialStateResolved] = useSettingsStore();

    const handleChange = event => {
        setSettings(prevState => {
            return {
                ...prevState,
                [event.target.name]: event.target.checked
            };
        });
    };

    return (
            <div>
                <label>
                    <input
                            type="checkbox"
                            name="showAvatar"
                            checked={settings.showAvatar}
                            onChange={handleChange}
                    />
                    <span>Show Avatar</span>
                </label>
                <label>
                    <input
                            type="checkbox"
                            name="showHistory"
                            checked={settings.showHistory}
                            onChange={handleChange}
                    />
                    <span>Show History</span>
                </label>
                {isInitialStateResolved && <div>Initial state from "chrome.storage" is loaded</div>}
                {!isPersistent && <div>Error writing to the chrome.storage: {error}</div>}
            </div>
    );
};

Or from content script:

// contentScript.js
import React from 'react';
import Avatar from './common/Avatar';
import History from './common/History';
import {useSettingsStore} from './common/useSettingsStore';


const Card = () => {
    const [settings] = useSettingsStore();

    return (
            <div>
                {settings.showAvatar && <Avatar/>}
                {settings.showHistory && <History/>}
            </div>
    );
};

In the same way you may use it for PopUp.

Initial Value flow

Say we have the next hook:

const [value, setValue, isPersistent, error, isInitialStateResolved] = useChromeStorageLocal('counterLocal', 1);

Say in the chrome.storage.local we already have: counterLocal: 10.

Changes of value:

1. value is 1 (initialValue set in the hook)
2. useChromeStorageLocal call to chrome API (this API is async) to get the value of counterLocal.

• value changes to 10
• isInitialStateResolved changes to true indicating that value synchronized with data saved in chrome.storage

Usage with chrome.storage.session

useChromeStorageSession and createChromeStorageStateHookSessin use chrome.storage.session to persist state. By default, it's not exposed to content scripts, but this behavior can be changed by calling chrome.storage.session.setAccessLevel('TRUSTED_AND_UNTRUSTED_CONTEXTS') (call it from background script). https://developer.chrome.com/docs/extensions/reference/storage/#method-StorageArea-setAccessLevel

Clearing or removing storage items

Suppose you want to reset all your stored items back to their initial values.

You could, for example, use chrome.storage.local.clear() (or their 'session', 'sync' counterparts) to clear the entire storage.
Alternatively, you can use chrome.storage.local.remove(key) to remove a specific storage item.

This will trigger a sync event in your useChromeStorage[Local|Session|Sync] hooks, setting them back to their initial value.

API

useChromeStorageLocal(key, initialValue?)

State will be persisted in chrome.storage.local (and updated from chrome.storage.local if it was updated in other contexts). If you want to use this hook in more than one place, use createChromeStorageStateHookLocal.

• key: string - The key used in chrome.storage.local
• initialValue: any = undefined - value which will be used if chrome.storage.local has no stored value yet or when a stored item is removed (unset)

Returns

[value, setValue, isPersistent, error, isInitialStateResolved]

• value: any - stateful value like first one returned from React.useState()
• setValue: function - function to update value like second one returned from React.useState()
• isPersistent: boolean - Will be true if data is persisted in chrome.storage.local. In case of error during chrome.storage.local.get or chrome.storage.local.set value will be stored in memory only and isPersistent will be set to false
• error: string - If isPersistent is true will contain empty string. Otherwise, will contain error returned by chrome.runtime.lastError.
• isInitialStateResolved: boolean - will set to true once initialValue will be replaced with stored in chrome.storage

useChromeStorageSync(key, initialValue?)

Similar to useChromeStorageLocal but will use chrome.storage.sync. State will be persisted in chrome.storage.sync (and updated from chrome.storage.sync if it was updated in other contexts). If you want to use this hook in more than one place, use createChromeStorageStateHookSync.

• key: string - The key used in chrome.storage.sync
• initialValue: any = undefined - value which will be used if chrome.storage.sync has no stored value yet

Returns

[value, setValue, isPersistent, error]

• value: any - stateful value like first one returned from React.useState()
• setValue: function - function to update value like second one returned from React.useState()
• isPersistent: boolean - Will be true if data is persisted in chrome.storage.sync. In case of error during chrome.storage.local.get or chrome.storage.local.set value will be stored in memory only and isPersistent will be set to false
• error: string - If isPersistent is true will contain empty string. Otherwise, will contain error returned by chrome.runtime.lastError.
• isInitialStateResolved: boolean - will set to true once initialValue will be replaced with stored in chrome.storage

useChromeStorageSession(key, initialValue?)

Similar to useChromeStorageLocal but will use chrome.storage.session. State will be persisted in chrome.storage.session (and updated from chrome.storage.session if it was updated in other contexts). If you want to use this hook in more than one place, use createChromeStorageStateHookSession.

• key: string - The key used in chrome.storage.session
• initialValue: any = undefined - value which will be used if chrome.storage.session has no stored value yet

Returns

[value, setValue, isPersistent, error]

• value: any - stateful value like first one returned from React.useState()
• setValue: function - function to update value like second one returned from React.useState()
• isPersistent: boolean - Will be true if data is persisted in chrome.storage.session. In case of error during chrome.storage.session.get or chrome.storage.session.set value will be stored in memory only and isPersistent will be set to false
• error: string - If isPersistent is true will contain empty string. Otherwise, will contain error returned by chrome.runtime.lastError.
• isInitialStateResolved: boolean - will set to true once initialValue will be replaced with stored in chrome.storage.session

createChromeStorageStateHookLocal(key, initialValue?)

In case you want to use same key in different components/extension contextsInstead you may create state hook which may be used across extension. See example. State will be persisted in chrome.storage.local.

• key: string - The key used in chrome.storage.local
• initialValue: any = undefined - value which will be used if chrome.storage.local has no stored value yet

Returns

function(): [any, (value: any) => void, boolean, string, boolean] - useChromeStorageLocal hook which may be used across extension's components/pages

createChromeStorageStateHookSync(key, initialValue?)

Similar to createChromeStorageStateHookLocal but uses chrome.storage.sync. In case you want to use same key in different components/extension contextsInstead you may create state hook which may be used across extension. See example and replace with createChromeStorageStateHookSync. State will be persisted in chrome.storage.sync.

• key: string - The key used in chrome.storage.sync
• initialValue: any = undefined - value which will be used if chrome.storage.sync has no stored value yet

Returns

function(): [any, (value: any) => void, boolean, string, boolean] - useChromeStorageSync hook which may be used across extension's components/pages

createChromeStorageStateHookSession(key, initialValue?)

Similar to createChromeStorageStateHookLocal but uses chrome.storage.session. In case you want to use same key in different components/extension contextsInstead you may create state hook which may be used across extension. See example and replace with createChromeStorageStateHookSession. State will be persisted in chrome.storage.session.

• key: string - The key used in chrome.storage.session
• initialValue: any = undefined - value which will be used if chrome.storage.session has no stored value yet

Returns

function(): [any, (value: any) => void, boolean, string, boolean] - useChromeStorageSession hook which may be used across extension's components/pages

Thanks to

use-local-storage-state for inspiration