Store static data to localStorage with expiration time

Static.js

/**
 * Copyright Muhammad Ibnuh
 * GITHUB: https://github.com/ibnuh
 * LICENSE: MIT
 */

import Store from 'store' // https://www.npmjs.com/package/store
import axios from 'axios'

class Static {
    /**
     * Initiate the get method
     *
     * @param {String} key
     */
    constructor(key) {
        this.key = key
        this.unix = (Date.now() / 1000) | 0
        return this.get()
    }

    /**
     * Check for the stored static data expire time
     */
    expired() {
        let storedExpire = Store.get('expire')
        if (storedExpire == null) {
            return true
        }
        return storedExpire < this.unix
    }

    /**
     * Get the data
     */
    get() {
        if (this.expired()) {
            return new Promise(resolve => {
                // Run ajax request
                axios.get('static.json').then(response => {
                    // Store the data to localstorage
                    this.store(response.data)
                    resolve(response.data[this.key])
                })
            })
        } else {
            return new Promise(resolve => {
                // Get the data from localstorage
                resolve(Store.get(this.key))
            })
        }
    }

    /**
     *  Store data to localstorage
     *  and set the expire time
     *
     * @param {Object} data
     */
    store(data) {
        Object.keys(data).forEach(function(key) {
            Store.set(key, data[key])
        })
        
        // Set the expire time to 1 hour from now
        Store.set('expire', this.unix + 3600)
    }
}

export default Static

static.json

{
   "articles":[
      {
         "title":"Color Psychology: Is there a link between colors...",
         "link":"https:\/\/lab.bpzoo.com\/color-psychology-is-there-a-link-between-colors-and-human-emotions\/",
         "author":"Aparna Raghavan",
         "published_at":"2018-07-05 23:34:51"
      },
      {
         "title":"Dream Interpretation \u2013 What do your dreams mean?",
         "link":"https:\/\/lab.bpzoo.com\/dream-interpretation-an-introduction\/",
         "author":"Jose Garcia",
         "published_at":"2018-06-15 22:48:40"
      }
   ],
   "fonts":[
      {
         "name":"Test Font",
         "family":"test_font"
      },
      {
         "name":"Mohave",
         "family":"mohave"
      }
   ],
   "test":123
}

Usage.js

let articles;

new Static('articles').then(data => {
    articles = data
})