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Preparing for a TypeScript Node.js interview with a focus on handling various APIs and other Node.js functionalities is a great approach. Given that video streaming might be one of the topics, it's good to be well-rounded in various areas of Node.js and TypeScript development. Here are 12 key categories, each with a brief description and an example of what a code snippet in that category might involve:

  1. API Interaction (REST, GraphQL)

    • Making HTTP requests to RESTful APIs using libraries like Axios or the native http module.
    • Querying GraphQL APIs.

  2. File Operations

    • Reading, writing, and streaming files, which is crucial for tasks like video streaming.

  3. Database Interaction

    • Connecting to and interacting with databases like MongoDB, PostgreSQL, or MySQL.

  4. Authentication and Authorization

    • Implementing user authentication (JWT, OAuth) and authorization.

  5. Error Handling and Logging

    • Structuring error handling middleware and implementing logging with libraries like Winston or Morgan.

  6. WebSockets and Real-Time Communication

    • Establishing real-time bi-directional communication using WebSockets or libraries like Socket.io.

  7. Unit and Integration Testing

    • Writing test cases using Jest, Mocha, or other testing frameworks.

  8. Video Streaming

    • Implementing video streaming using Node.js streams, handling partial content delivery for efficient video playback.

  9. Environment Configuration and Security

    • Managing environment variables and securing Node.js applications (using helmet, rate limiting, CORS settings).

  10. Performance Optimization

    • Techniques for improving Node.js app performance, such as clustering, caching, or load balancing.

  11. TypeScript Specifics

    • Utilizing TypeScript features like types, interfaces, decorators, and generics in a Node.js context.

  12. Microservices and Message Queues

    • Building microservices architectures and integrating message queues (like RabbitMQ or Kafka).

Each of these categories can be expanded with specific examples and detailed explanations, depending on the depth of knowledge required for your interview. If you need code snippets or further elaboration on any of these topics, feel free to ask!