A tiny (<1kb) localStorage and sessionStorage helper library.
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Bin Build Status

A tiny (< 1kb) localStorage and sessionStorage helper library.

It automatically parses objects and arrays into strings (and back). It also let's you validate and expire localStorage data after a set period of time.

Want to learn how to write your own vanilla JS libraries? Check out my Vanilla JS Pocket Guides or join the Vanilla JS Academy and level-up as a web developer. 🚀

Installing Bin

Compiled and production-ready code can be found in the dist directory. The src directory contains development code.

Direct Download

You can download the files directly from GitHub.

<script src="path/to/bin.min.js"></script>


You can also use the jsDelivr CDN. I recommend linking to a specific version number or version range to prevent major updates from breaking your site. Bin uses semantic versioning.

<!-- Always get the latest version -->
<!-- Not recommended for production sites! -->
<script src="https://cdn.jsdelivr.net/gh/cferdinandi/bin/dist/bin.min.js"></script>

<!-- Get minor updates and patch fixes within a major version -->
<script src="https://cdn.jsdelivr.net/gh/cferdinandi/bin@1/dist/bin.min.js"></script>

<!-- Get patch fixes within a minor version -->
<script src="https://cdn.jsdelivr.net/gh/cferdinandi/bin@1.0/dist/bin.min.js"></script>

<!-- Get a specific version -->
<script src="https://cdn.jsdelivr.net/gh/cferdinandi/bin@1.0.0/dist/bin.min.js"></script>


Before working with Bin, you need to instantiate a new instance. Pass in the ID you would like to use for your localStorage/sessionStorage data as an argument.

Bin defaults to localStorage. You can optionally pass in true as a second argument to use sessionStorage instead.

// Instantiate a new localStorage instance
var myBin = new Bin('myBinID');

// Instantiate a new sessionStorage instance
var myBinSession = new Bin('myBinSessionID', true);


Save data to storage.

Pass in your data as an argument. It can be an object, array, string, number---any valid JavaScript object type. Bin will automatically convert it to a string for storage.

// Store an object
	sandwich: 'turkey',
	drink: 'soda',
	chips: true

// Store an array

// Store a string
myBin.set('I love Cape Cod potato chips!');

// Store a number


Get data from storage. You can optionally pass in a fallback to use if no data is found.

// Get data from storage

// Use a fallback object

// Use a fallback array

// Use a fallback string

// Use a fallback number


Check if a certain amount of time has passed since the data was saved to storage. Pass in the amount of time in milliseconds that the data is good for as an argument.

// 1 hour
myBin.isValid(1000 * 60 * 60);

// 1 day
myBin.isValid(1000 * 60 * 60 * 24);

// 1 week
myBin.isValid(1000 * 60 * 60 * 24 * 7);

// 1 year
myBin.isValid(1000 * 60 * 60 * 24 * 365);

// 15 minutes
myBin.isValid(1000 * 60 * 15);

// 2 days
myBin.isValid(1000 * 60 * 60 * 24 * 2);


Remove data from storage. The instance will remain available, but the data will be wiped from localStorage/sessionStorage.


Working with the Source Files

If you would prefer, you can work with the development code in the src directory using the included Gulp build system. This compiles, lints, and minifies code.


Make sure these are installed first.

Quick Start

  1. In bash/terminal/command line, cd into your project directory.
  2. Run npm install to install required files.
  3. When it's done installing, run one of the task runners to get going:
    • gulp manually compiles files.
    • gulp watch automatically compiles files when changes are made and applies changes using LiveReload.

Browser Compatibility

Bin works in all modern browsers, and IE 8 and above.


The code is available under the MIT License.