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Installation

System Requirements

Requirement	Minimum Version
Node.js	v18.0+
npm	v9.0+
MongoDB	v6.0+

Install Dependencies

npm install

Key Dependencies

Package	Purpose
`express`	HTTP server
`mongoose`	MongoDB ODM
`argon2`	Password hashing (argon2id)
`zod`	Request validation
`helmet`	Security headers
`express-rate-limit`	Rate limiting
`cookie-parser`	Cookie handling
`dotenv`	Environment variables
`ua-parser-js`	Device detection

MongoDB Setup

Local MongoDB:

# Start MongoDB (varies by OS)
mongod --dbname modularauth

MongoDB Atlas:

Use your Atlas connection string in .env:

MONGODB_URI=mongodb+srv://user:pass@cluster.mongodb.net/modularauth

Environment Configuration

Copy .env.example to .env:

cp .env.example .env

See Environment Variables for all options.