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 < 600 bytes. Also, it's tree-shaking friendly, so you'll probably end up using fewer than 500 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

import { set } from "@michaukrieg/idb-keyval";

set("hello", "world");
set("foo", "bar");

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

All methods return promises:

import { set } from "@michaukrieg/idb-keyval";

set("hello", "world")
  .then(() => console.log("It worked!"))
  .catch((err) => console.log("It failed!", err));

get

import { get } from "@michaukrieg/idb-keyval";

// logs: "world"
get("hello").then((val) => console.log(val));

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

getAll

import { getAll } from "@michaukrieg/idb-keyval";

// logs: [ "bar", "world" ]
getAll().then((val) => console.log(val));

keys

import { keys } from "@michaukrieg/idb-keyval";

// logs: ["hello", "foo"]
keys().then((keys) => console.log(keys));

del

import { del } from "@michaukrieg/idb-keyval";

del("hello");

clear

import { clear } from "@michaukrieg/idb-keyval";

clear();

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:

import { Store, set } from "@michaukrieg/idb-keyval";

const customStore = new Store("custom-db-name", "custom-store-name");
set("foo", "bar", customStore);

That's it!

Installing

Via npm + webpack/rollup

npm install @michaukrieg/idb-keyval

Now you can require/import @michaukrieg/idb-keyval:

import { get, set } from "@michaukrieg/idb-keyval";

If you're targeting older versions of IE, you may have more luck with:

const idb = require("@michaukrieg/idb-keyval/dist/idb-keyval-cjs-compat.min.js");

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.
• dist/idb-keyval-iife.min.js As above, but minified.
• dist/idb-keyval-iife-compat.min.js As above, but works in older browsers such as IE 10.
• dist/idb-keyval-amd.js is an AMD module.
• dist/idb-keyval-amd.min.js As above, but minified.