Justin Core

The @just-in/core package is a lightweight, event-driven framework for building Just-In-Time Adaptive Interventions (JITAIs). It helps research app developers define, schedule, and deliver adaptive interventions using events, decision rules, and tasks.

Requirements

@just-in/core requires a connection to a MongoDB server. We have guides to walk you through selecting and configuring a MongoDB installation to work with JustIn.

@just-in/core is avilable via npm and can be used by applications written in TypeScript or JavaScript. @just-in/core iteself is written in TypeScript, so all of our documentation and examples will be offered in TypeScript.

@just-in/core requires node version 20+. You can check your version via node --version and if you need to upgrade you can do so at the nodejs website.

To use @just-in/core in an application, create an npm package and install just-in/core.

If using yarn:

$ mkdir my-justin-app
$ cd my-justin-app
$ yarn init 
$ yarn add @just-in/core

If using npm:

$ mkdir my-justin-app
$ cd my-justin-app
$ npm init 
$ npm install @just-in/core

You can also start with one of our examples (recommended), or our tutorial.