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Puppeteer

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A Node.js library for controlling headless Chrome via DevTools.

Automates web scraping, testing, and PDF generation. Essential for automating browser tasks programmatically.

Express.js

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A flexible Node.js web framework for building applications.

Creates APIs and web servers quickly. Widely adopted for its simplicity and extensibility.

Sequelize

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A promise-based ORM for Node.js, supporting SQL databases.

Manages database operations efficiently.  Simplifies querying and relationships for scalable applications.

Mongoose

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A MongoDB object modeling tool for Node.js.

Facilitates schema definition and data validation.  Crucial for integrating MongoDB in Node.js apps.

Passport.js

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Authentication middleware for Node.js, supporting multiple strategies.

Simplifies user authentication.  Key for adding security to web applications.

Socket.io

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Enables real-time, bidirectional communication between clients and servers.

Essential for real-time apps like chats and notifications.  Maintains persistent connections.

Winston

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A Node.js logging library supporting multiple transports.

Creates robust logging systems.  Key for debugging and monitoring applications.