Simple NodeJS JSON Database.

Database.ts

import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'fs'
import { dirname, resolve } from 'path'

export class Store<T extends Record<any, any>> {
  protected readonly aPath: string
  protected readonly data: T
  constructor(path: string) {
    this.aPath = resolve(__dirname, path)

    if (!existsSync(this.aPath)) {
      const directory = dirname(this.aPath)
      mkdirSync(directory, { recursive: true })
      writeFileSync(this.aPath, JSON.stringify({}))
    }

    this.data = JSON.parse(readFileSync(this.aPath, 'utf8'))
  }

  public get<K extends keyof T>(key: K): T[K] {
    return this.data[key]
  }

  public set<K extends keyof T>(key: K, value: T[K]): this {
    this.data[key] = value
    return this
  }

  public update<K extends keyof T>(key: K, update: Partial<T[K]>): this {
    this.data[key] = { ...this.data[key], ...update }
    return this
  }

  public delete<K extends keyof T>(key: K): this {
    delete this.data[key]
    return this
  }

  public keys<K extends keyof T>(): K[] {
    return Object.keys(this.data) as K[]
  }

  public values<K extends keyof T>(): (T[K])[] {
    return Object.values(this.data)
  }

  public entries<K extends keyof T>(): [K, T[K]][] {
    return Object.entries(this.data) as [K, T[K]][]
  }

  public save(): this {
    writeFileSync(this.aPath, JSON.stringify(this.data))
    return this
  }
}