cubby

Simple synchronous JSON storage for Node.js, fully typed, no runtime deps.

Installation

npm install cubby

API (TypeScript)

import cubby from 'cubby';

// Arrays
const users = cubby<string[]>('users', []);
users.push('a'); // persists to <projectRoot>/.cubby/users.json

// Objects
const settings = cubby('settings', { theme: 'light' });
settings.theme = 'dark'; // persists

Validation with Zod (checked before persisting):

import { z } from 'zod';
const Tag = z.string();
const tags = cubby('tags', [] as string[], { schema: z.array(Tag) });
tags.push('ok');
// throws and does not persist
// @ts-ignore
tags.push(123);

API

type ZodLikeSchema<T> = {
  safeParse(input: unknown): { success: true; data: T } | { success: false; error: unknown };
};
function cubby<T>(name: string, defaultValue: T, options?: {
  schema?: ZodLikeSchema<T>;
  dir?: string;
  writeDebounceMs?: number;
}): T;

Storage location

• Defaults to <projectRoot>/.cubby/<name>.json where projectRoot is the nearest directory containing a package.json when starting from process.cwd().
• Override with dir if you want a custom directory (tests, ephemeral data, etc.).

Debounced writes

Provide writeDebounceMs to reduce filesystem churn when performing many updates in quick succession.

Migration from v0.x

No API change for common usage. You can continue using:

const users = cubby('users', []);
users.push('test');

Testing

This project uses Node's built-in test runner.

npm test