Question 1

How to connect Mongoose to MongoDB in Node.js?

Accepted Answer

Use mongoose.connect() with the MongoDB URI. Mongoose buffers commands until connected, so you can define models immediately. Handle errors with async/await or promises for robust connections.

Question 2

Mongoose vs native MongoDB driver – which is better?

Accepted Answer

Mongoose is better for structured apps with validation and relationships, while the native driver offers more control and performance for simple or high-throughput tasks. Choose based on project complexity.

Question 3

How to use Mongoose middleware for logging?

Accepted Answer

Define pre or post hooks on schemas for operations like 'save'. For example, use pre('save', function(next) { console.log(this); next(); }) to log document data before saving to the database.

Question 4

Mongoose population not working – how to fix?

Accepted Answer

Ensure referenced models are properly defined and populated paths exist. Check for typos in field names and use populate() with correct options, as detailed in the documentation for pseudo-JOINs.

Question 5

How to handle validation errors in Mongoose?

Accepted Answer

Validation errors are thrown when saving invalid data. Catch them in try-catch blocks or use error middleware in frameworks like Express to send user-friendly responses.

Question 6

Mongoose transactions how to use?

Accepted Answer

Use sessions with mongoose.startSession() for transactions. Wrap operations in session.withTransaction() to ensure atomicity, following patterns similar to the MongoDB driver for consistency.

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