# localForage [![Build Status](https://travis-ci.org/localForage/localForage.svg?branch=master)](http://travis-ci.org/localForage/localForage) [![NPM version](https://badge.fury.io/js/localforage.svg)](http://badge.fury.io/js/localforage) [![Dependency Status](https://img.shields.io/david/localForage/localForage.svg)](https://david-dm.org/localForage/localForage) [![npm](https://img.shields.io/npm/dm/localforage.svg?maxAge=2592000)](https://npmcharts.com/compare/localforage?minimal=true) [![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/localforage/badge?style=rounded)](https://www.jsdelivr.com/package/npm/localforage) [![minzipped size](https://badgen.net/bundlephobia/minzip/localforage)](https://bundlephobia.com/result?p=localforage@1.10.0) localForage is a fast and simple storage library for JavaScript. localForage improves the offline experience of your web app by using asynchronous storage (IndexedDB or WebSQL) with a simple, `localStorage`-like API. localForage uses localStorage in browsers with no IndexedDB or WebSQL support. See [the wiki for detailed compatibility info][supported browsers]. To use localForage, just drop a single JavaScript file into your page: ```html ``` Try the [live example](http://codepen.io/thgreasi/pen/ojYKeE). Download the [latest localForage from GitHub](https://github.com/localForage/localForage/releases/latest), or install with [npm](https://www.npmjs.com/): ```bash npm install localforage ``` [supported browsers]: https://github.com/localForage/localForage/wiki/Supported-Browsers-Platforms ## Support Lost? Need help? Try the [localForage API documentation](https://localforage.github.io/localForage). [localForage API文档也有中文版。](https://localforage.docschina.org) If you're having trouble using the library, running the tests, or want to contribute to localForage, please look through the [existing issues](https://github.com/localForage/localForage/issues) for your problem first before creating a new one. If you still need help, [feel free to file an issue](https://github.com/localForage/localForage/issues/new). # How to use localForage ## Callbacks vs Promises Because localForage uses async storage, it has an async API. It's otherwise exactly the same as the [localStorage API](https://hacks.mozilla.org/2009/06/localstorage/). localForage has a dual API that allows you to either use Node-style callbacks or [Promises](https://www.promisejs.org/). If you are unsure which one is right for you, it's recommended to use Promises. Here's an example of the Node-style callback form: ```js localforage.setItem('key', 'value', function (err) { // if err is non-null, we got an error localforage.getItem('key', function (err, value) { // if err is non-null, we got an error. otherwise, value is the value }); }); ``` And the Promise form: ```js localforage.setItem('key', 'value').then(function () { return localforage.getItem('key'); }).then(function (value) { // we got our value }).catch(function (err) { // we got an error }); ``` Or, use `async`/`await`: ```js try { const value = await localforage.getItem('somekey'); // This code runs once the value has been loaded // from the offline store. console.log(value); } catch (err) { // This code runs if there were any errors. console.log(err); } ``` For more examples, please visit [the API docs](https://localforage.github.io/localForage). ## Storing Blobs, TypedArrays, and other JS objects You can store any type in localForage; you aren't limited to strings like in localStorage. Even if localStorage is your storage backend, localForage automatically does `JSON.parse()` and `JSON.stringify()` when getting/setting values. localForage supports storing all native JS objects that can be serialized to JSON, as well as ArrayBuffers, Blobs, and TypedArrays. Check the [API docs][api] for a full list of types supported by localForage. All types are supported in every storage backend, though storage limits in localStorage make storing many large Blobs impossible. [api]: https://localforage.github.io/localForage/#data-api-setitem ## Configuration You can set database information with the `config()` method. Available options are `driver`, `name`, `storeName`, `version`, `size`, and `description`. Example: ```javascript localforage.config({ driver : localforage.WEBSQL, // Force WebSQL; same as using setDriver() name : 'myApp', version : 1.0, size : 4980736, // Size of database, in bytes. WebSQL-only for now. storeName : 'keyvaluepairs', // Should be alphanumeric, with underscores. description : 'some description' }); ``` **Note:** you must call `config()` _before_ you interact with your data. This means calling `config()` before using `getItem()`, `setItem()`, `removeItem()`, `clear()`, `key()`, `keys()` or `length()`. ## Multiple instances You can create multiple instances of localForage that point to different stores using `createInstance`. All the configuration options used by [`config`](#configuration) are supported. ``` javascript var store = localforage.createInstance({ name: "nameHere" }); var otherStore = localforage.createInstance({ name: "otherName" }); // Setting the key on one of these doesn't affect the other. store.setItem("key", "value"); otherStore.setItem("key", "value2"); ``` ## RequireJS You can use localForage with [RequireJS](http://requirejs.org/): ```javascript define(['localforage'], function(localforage) { // As a callback: localforage.setItem('mykey', 'myvalue', console.log); // With a Promise: localforage.setItem('mykey', 'myvalue').then(console.log); }); ``` ## TypeScript If you have the [`allowSyntheticDefaultImports` compiler option](https://www.typescriptlang.org/docs/handbook/compiler-options.html) set to `true` in your [tsconfig.json](https://www.typescriptlang.org/docs/handbook/tsconfig-json.html) (supported in TypeScript v1.8+), you should use: ```javascript import localForage from "localforage"; ``` Otherwise you should use one of the following: ```javascript import * as localForage from "localforage"; // or, in case that the typescript version that you are using // doesn't support ES6 style imports for UMD modules like localForage import localForage = require("localforage"); ``` ## Framework Support If you use a framework listed, there's a localForage storage driver for the models in your framework so you can store data offline with localForage. We have drivers for the following frameworks: * [AngularJS](https://github.com/ocombe/angular-localForage) * [Angular 4 and up](https://github.com/Alorel/ngforage/) * [Backbone](https://github.com/localForage/localForage-backbone) * [Ember](https://github.com/genkgo/ember-localforage-adapter) * [Vue](https://github.com/dmlzj/vlf) * [NuxtJS](https://github.com/nuxt-community/localforage-module) If you have a driver you'd like listed, please [open an issue](https://github.com/localForage/localForage/issues/new) to have it added to this list. ## Custom Drivers You can create your own driver if you want; see the [`defineDriver`](https://localforage.github.io/localForage/#driver-api-definedriver) API docs. There is a [list of custom drivers on the wiki][custom drivers]. [custom drivers]: https://github.com/localForage/localForage/wiki/Custom-Drivers # Working on localForage You'll need [node/npm](http://nodejs.org/) and [bower](http://bower.io/#installing-bower). To work on localForage, you should start by [forking it](https://github.com/localForage/localForage/fork) and installing its dependencies. Replace `USERNAME` with your GitHub username and run the following: ```bash # Install bower globally if you don't have it: npm install -g bower # Replace USERNAME with your GitHub username: git clone git@github.com:USERNAME/localForage.git cd localForage npm install bower install ``` Omitting the bower dependencies will cause the tests to fail! ## Running Tests You need PhantomJS installed to run local tests. Run `npm test` (or, directly: `grunt test`). Your code must also pass the [linter](http://jshint.com/). localForage is designed to run in the browser, so the tests explicitly require a browser environment. Local tests are run on a headless WebKit (using [PhantomJS](http://phantomjs.org)). When you submit a pull request, tests will be run against all browsers that localForage supports on Travis CI using [Sauce Labs](https://saucelabs.com/). ## Library Size As of version 1.7.3 the payload added to your app is rather small. Served using gzip compression, localForage will add less than 10k to your total bundle size:

minified: `~29kB`
gzipped: `~8.8kB`
brotli'd: `~7.8kB`

# License This program is free software; it is distributed under an [Apache License](https://github.com/localForage/localForage/blob/master/LICENSE). --- Copyright (c) 2013-2016 [Mozilla](https://mozilla.org) ([Contributors](https://github.com/localForage/localForage/graphs/contributors)).

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