quickstore.js

const fs = require('fs')

// Define class for quick object store
class QuickStore {
        constructor(loc="quickstore.json") {
                this.loc = loc;
                this.memObj = {};
                this.queue = [];
                try {
                        this.memObj = JSON.parse(fs.readFileSync(this.loc));
                }
                catch (e) {
                        if (e.code = 'ENOENT') {
                                this.memObj = {};
                        }
                }
        }

        update() {
                fs.writeFile(this.loc, JSON.stringify(this.memObj, null, 2), (err) => {
                            if (err) throw err;
                });

        }

        setVal(key, data, array=false) {
                const keys = key.split(".");
                let pointer = this.memObj;
                keys.forEach(k => {
                        if (keys.indexOf(k) == keys.length - 1) {
                                if (array) pointer[k] = (pointer[k] && pointer[k].concat(data)) || [data];
                                else pointer[k] = data;
                        }
                        else if (!pointer.hasOwnProperty(k)) {
                                pointer[k] = {};
                        }
                        pointer = pointer[k]

                });
                this.update()
        }

        set(key, data) {
                this.setVal(key, data);
        }

        push(key, data) {
                this.setVal(key, data, true)
        }

        add(key, data) {
                if (this.get(key) == undefined) {
                        this.set(key, data)
                }
                else this.set(key, this.get(key) + data)
        }

        get(key) {
                const keys = key.split(".")
                let pointer = this.memObj;

                keys.forEach(k => pointer = pointer[k])

                return pointer;
        }
}

let db = new QuickStore('test.json')

// Setting an object in the database:
db.set('userInfo', { difficulty: 'Easy' })
// -> { difficulty: 'Easy' }
//
// Pushing an element to an array (that doesn't exist yet) in an object:
db.push('userInfo.items', 'Sword')
// -> { difficulty: 'Easy', items: ['Sword'] }
//
// Adding to a number (that doesn't exist yet) in an object:
db.add('userInfo.balance', 500)
// -> { difficulty: 'Easy', items: ['Sword'], balance: 500 }
//
// Repeating previous examples:
db.push('userInfo.items', 'Watch')
// -> { difficulty: 'Easy', items: ['Sword', 'Watch'], balance: 500 }
db.add('userInfo.balance', 500)
// -> { difficulty: 'Easy', items: ['Sword', 'Watch'], balance: 1000 }
//
// Fetching individual properties
console.log(db.get('userInfo.balance')) // -> 1000
console.log(db.get('userInfo.items')) // ['Sword', 'Watch']