Instruction: Discuss the techniques for managing sessions in Node.js, including the use of external stores.
Context: This question tests the candidate's ability to implement session management, critical for maintaining state in stateless HTTP transactions.
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Let’s start with the basics. Node.js, being a server-side JavaScript runtime, naturally supports sessions through various middleware. The most common approach I’ve implemented in my projects, particularly when working as a Backend Developer, involves using the express-session middleware. This middleware is not only easy to set up but also highly customizable, making it suitable for a range of applications.
The express-session middleware stores session data on the server; however, it stores the session ID in the cookie on the client-side by default. While this is efficient for small-scale applications, scalability concerns arise as your user base grows. This is where external stores come into play. External...