NestJs Questions

To validate the data type of an input parameter.

To transform a numeric string into an integer.

To convert a string value to a Boolean.

To parse an object into a JSON string.

Encrypting sensitive data

Storing user credentials

Defining API routes

Validating incoming requests and verifying user authentication

When you need to perform standard JWT (JSON Web Token) authentication.

When you need to implement authorization logic tailored to your application's specific requirements, which might involve checking for custom permissions or conditions.

When you want to handle database migrations automatically.

When you need to send emails after a user signs up.

It contains the logic to transform the input data.

It specifies how the Pipe should handle errors.

It determines if the Pipe should be applied globally.

It defines the metadata associated with the Pipe.

It validates the data type of a method parameter.

It attaches metadata to a class or method.

It defines a custom decorator factory.

It applies middleware to a specific route handler.

To interact with a specific collection in the database based on a defined schema

To create and manage database migrations

To handle user authentication and authorization

To define a database connection string

Centralized management and organization of event listeners

Enhanced type safety when defining event listeners

Automatic retry mechanisms for failed event handlers

Improved performance for handling a large volume of events

To reduce the need for manual testing efforts completely

To minimize the execution time of the entire test suite

To eliminate the possibility of introducing bugs during development entirely

To ensure comprehensive test coverage across different levels of the application

Relying on client-side load balancing

Hardcoding service addresses

Using a service registry (e.g., Consul, etcd)

Manually updating configuration files

Regression Testing

Integration Testing

Unit Testing

End-to-End (E2E) Testing