A minimal API wrapper for localStorage. Simple as your high-school locker.

Lockr (pronounced /ˈlɒkəʳ/) is an extremely lightweight library (<2kb when minified), designed to facilitate how you interact with localStorage. Saving objects and arrays, numbers or other data types, accessible via a Redis-like API, heavily inspired by node_redis.

How to use lockr

In order to user lockr, you firstly need to install it in your project.

npm install lockr --save

or maybe download it manually from JSDelivr and hook it in your HTML.

API reference

Lockr.prefix - String

Set a prefix to a string value that is going to be prepended to each key saved by Lockr.

Example

Lockr.prefix = 'lockr_';
Lockr.set('username', 'Coyote'); // Saved as string
localStorage.getItem('username');
> null
localStorage.getItem('lockr_username');
> {"data":"Coyote"}

Please note that when prefix is set, flush method deletes only keys that are prefixed, and ignores the rest.

Lockr.set - arguments: [ key, value ] {String, Number, Array or Object}

Set a key to a particular value or a hash object (Object or Array) under a hash key.

Example

Lockr.set('username', 'Coyote'); // Saved as string
Lockr.set('user_id', 12345); // Saved as number
Lockr.set('users', [{name: 'John Doe', age: 18}, {name: 'Jane Doe', age: 19}]);

Lockr.get - arguments: [ key or hash_key, default value ]

Returns the saved value for given key, even if the saved value is hash object. If value is null or undefined it returns a default value.

Example

Lockr.get('username');
> "Coyote"

Lockr.get('user_id');
> 12345

Lockr.get('users');
>  [{name: 'John Doe', age: 18}, {name: 'Jane Doe', age: 19}]

Lockr.get('score', 0):
> 0

Lockr.set('score', 3):
Lockr.get('score', 0):
> 3

Lockr.rm - arguments: [ key ] {String}

Remove a key from localStorage entirely.

Example

Lockr.set('username', 'Coyote'); // Saved as string
Lockr.get('username');
> "Coyote"
Lockr.rm('username');
Lockr.get('username');
> undefined

Lockr.sadd - arguments [ key, value ]{String, Number, Array or Object}

Adds a unique value to a particular set under a hash key.

Example

Lockr.sadd("wat", 1); // [1]
Lockr.sadd("wat", 2); // [1, 2]
Lockr.sadd("wat", 1); // [1, 2]

Lockr.smembers - arguments [ key ]

Returns the values of a particular set under a hash key.

Example

Lockr.sadd("wat", 42);
Lockr.sadd("wat", 1337);
Lockr.smembers("wat"); // [42, 1337]

Lockr.sismember - arguments [ key, value ]

Returns whether the value exists in a particular set under a hash key.

Example

Lockr.sadd("wat", 1);
Lockr.sismember("wat", 1); // true
Lockr.sismember("wat", 2); // false

Lockr.srem - arguments [ key, value ]

Removes a value from a particular set under a hash key.

Example

Lockr.sadd("wat", 1);
Lockr.sadd("wat", 2);
Lockr.srem("wat", 1);
Lockr.smembers("wat"); // [2]

Lockr.getAll - arguments: null

Returns all saved values & objects, in an Array

Example

Lockr.getAll();
> ["Coyote", 12345, [{name: 'John Doe', age: 18}, {name: 'Jane Doe', age: 19}]]

Lockr.getAll - arguments: [includeKeys] {Boolean}

Returns contents of localStorage as an Array of dictionaries that contain key and value of the saved item.

Example

Lockr.getAll(true);
> [{"username": "Coyote"}, {"user_id": 12345}, {"users": [{name: 'John Doe', age: 18}, {name: 'Jane Doe', age: 19}]}]

Lockr.flush() - arguments: null

Empties localStorage().

Example

localStorage.length;
> 3
Lockr.flush();
localStorage.length;
> 0