IDB-Keyval

This is a super-simple-small promise-based keyval store implemented with IndexedDB, largely based on async-storage by Mozilla.

localForage offers similar functionality, but supports older browsers with broken/absent IDB implementations. Because of that, it's 7.4k, whereas idb-keyval is ~550 bytes. Also, it's tree-shaking friendly, so you'll probably end up using fewer than 450 bytes. Pick whichever works best for you!

This is only a keyval store. If you need to do more complex things like iteration & indexing, check out IDB on NPM (a little heavier at 1.7k). The first example in its README is how to recreate this library.

Usage

set:

1import { set } from 'idb-keyval';
2
3set('hello', 'world');
4set('foo', 'bar');

Since this is IDB-backed, you can store anything structured-clonable (numbers, arrays, objects, dates, blobs etc).

All methods return promises:

1import { set } from 'idb-keyval';
2
3set('hello', 'world')
4  .then(() => console.log('It worked!'))
5  .catch(err => console.log('It failed!', err));

get:

1import { get } from 'idb-keyval';
2
3// logs: "world"
4get('hello').then(val => console.log(val));

If there is no 'hello' key, then val will be undefined.

keys:

1import { keys } from 'idb-keyval';
2
3// logs: ["hello", "foo"]
4keys().then(keys => console.log(keys));

del:

1import { del } from 'idb-keyval';
2
3del('hello');

clear:

1import { clear } from 'idb-keyval';
2
3clear();

Custom stores:

By default, the methods above use an IndexedDB database named keyval-store and an object store named keyval. You can create your own store, and pass it as an additional parameter to any of the above methods:

1import { Store, set } from 'idb-keyval';
2
3const customStore = new Store('custom-db-name', 'custom-store-name');
4set('foo', 'bar', customStore);

That's it!

Installing

Via npm + webpack/rollup

1npm install idb-keyval

Now you can require/import idb-keyval:

1import { get, set } from 'idb-keyval';

Via <script>

• dist/idb-keyval.mjs is a valid JS module.
• dist/idb-keyval-iife.js can be used in browsers that don't support modules. idbKeyval is created as a global.