@diaskappassov/hungry-local-storage

hungry-local-storage

💾⌛ Tool for store temporary data in local storage (with autodelete expired data).

About

This is a simple tool for storing data in localStorage with expiration time. It's useful for storing temporary data, such as user preferences, but also for storing data that is not needed after a certain period of time.

Why hungry-local-storage?

The reason why I called this package hungry-local-storage is that he is endlessly hungry thats allowed to eat only after the item's store time expires. And it checks at specified intervals (every N seconds you specify) whether the object's storage period has expired so that it can be eaten. Such an obedient, hungry tool.

Usage

Installing

$ npm i "@diaskappassov/hungry-local-storage"

Usage

Setting values to localStorage with expiration

import { hls } from "@diaskappassov/hungry-local-storage";

// No expire time
hls.set("cherry", "string");

const curTimestamp = new Date().getTime() / 1000;
// Expires after 60 seconds
hls.set("banana", 123, curTimestamp + 60);

// Expires after 3600 seconds
hls.set("apple", [1, 2, 3], curTimestamp + 3600);

// Expires after 10 minutes
hls.set("avocado", {}, { minutes: 10 });

// Expires after 3 days
hls.set("tea", { type: "green", count: 2 }, { days: 3 });

// Expires after 7 seconds + 6 minutes + 5 hours + 4 days+ 3 weeks + 2 months + 1 year
hls.set("cake", "CAAAKE!", {
  seconds: 7,
  minutes: 6,
  hours: 5,
  days: 4,
  weeks: 3,
  months: 2,
  years: 1,
});

Getting value from localStorage

Imagine that you run hls.set("apple", [1, 2, 3], { hours: 1 });, and you want to get this value from localStorage.

import { hls } from "@diaskappassov/hungry-local-storage";

// Returns parsed value if not expired, otherwise returns null with removing expired item from localStorage
const apple = hls.get("apple");

console.log(apple); // [1, 2, 3]

Removing expired items from localStorage

import { hls } from "@diaskappassov/hungry-local-storage";

// Removes all expired items and returns count of removed items by function flush
const countRemoved = hls.flush();
console.log("flush returned:", countRemoved);

Don't worry, flush not removes localStorage items that's not have expiration field on top level of structure.

Setting Auto Flush

By default auto flush is disabled. To enable it, execute setAutoFlush method with setting values in seconds.

import { hls } from "@diaskappassov/hungry-local-storage";

// Set auto flush that runs flush every 10 minutes
hls.setAutoFlush(60 * 10);

If you run setAutoFlush method twice with different values, then the last value will be used, and it will finish all old autoFlush timers.

If you set auto flush value to null then auto flush will be disabled.

import { hls } from "@diaskappassov/hungry-local-storage";

// Disable auto flush
hls.setAutoFlush(null);

Removing item from localStorage

import { hls } from "@diaskappassov/hungry-local-storage";

// Removes item with key "apple".
hls.remove("apple");

Under code hls.remove just runs localStorage.removeItem method

Structure of created item by hls

After running code hls.set("apple", [1, 2, 3], { hours: 5 });, in local storage it will be stored as follows:

{
  creation: CURRENT_TIMESTAMP,
  data: "[1,2,3]",
  expiration: CURRENT_TIMESTAMP + HOURS_5,
}

Property expiration is optional, it means, if expiration is not exists, it will be stored in local storage while you will not delete it.

License

MIT

Authors

• Dias1c