fjsondb: The Simplest JSON Database for Node.js (Zero Dependencies)

Sometimes you don't need Postgres. Sometimes you don't even need SQLite. You just need to store some JSON and read it back. That's fjsondb.

What Is It?

A fast, file-based JSON database for Node.js. No server, no configuration, no dependencies. Just your data in a JSON file.

Why?

• Prototyping and you need persistence NOW
• Small tools that don't justify a real database
• Configuration storage
• Local caching
• Any project where "just use a JSON file" is the right answer

Usage

import { FJsonDB } from 'fjsondb';

const db = new FJsonDB('mydata.json');

// Write
await db.set('users.john', { name: 'John', age: 30 });

// Read
const john = await db.get('users.john');

// Delete
await db.delete('users.john');

That's it. No schema, no migrations, no ORM. Just get/set/delete.

Features

• ⚡ Fast — file I/O with intelligent caching
• 📦 Zero dependencies — just Node.js
• 🔑 Dot notation — nested paths like users.john.email
• 💾 Persistent — survives restarts
• 🔒 Atomic writes — no corrupted files
• 📝 TypeScript — full type support

When NOT to Use This

• Multi-user applications
• Data larger than ~100MB
• Complex queries or relations
• Production databases with high concurrency

For everything else, fjsondb is probably all you need.

👉 GitHub: https://github.com/p32929/fjsondb

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What's your go-to for quick-and-dirty data storage in Node.js?