typicode/lowdb

Lowdb is a small, simple database that stores data as a JSON file on your computer or device. Think of it like a notepad your app can read and write to, rather than a full database server. It solves the problem of needing to save and retrieve data without setting up complex database infrastructure. It works by reading a JSON file into memory as a plain JavaScript object, letting you modify it using regular JavaScript methods, then saving it back to the file when you are done. Because your data is just a JavaScript object, you search and filter it using the same array methods you already know, like finding an item by its ID or sorting a list by a field. You would use lowdb when building small projects, prototypes, desktop apps built with Electron, command-line tools, or any situation where you want persistent data storage without the overhead of a database server. It also supports storing data in the browser's local storage or session storage instead of a file. The library supports TypeScript for type checking, meaning you can define the shape of your data and catch mistakes before running your code. It can also be extended with additional utility libraries. It automatically switches to an in-memory mode during automated tests to keep things fast. Lowdb is a JavaScript library installable via npm.