Role-based authorization in NestJS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is role-based authorization in NestJS?

Role-based authorization in NestJS controls access to resources by assigning roles to users and allowing or denying actions based on those roles.

beginner

Which NestJS feature helps implement role-based authorization easily?

Guards, especially custom guards like RolesGuard, help implement role-based authorization by checking user roles before allowing access.

intermediate

How do you define roles on a route in NestJS?

You use a custom decorator like @Roles('admin') on a controller method to specify which roles can access that route.

intermediate

What is the purpose of the RolesGuard in NestJS?

RolesGuard reads the roles required by a route and compares them with the user's roles to decide if access should be granted.

beginner

Why is role-based authorization important in web applications?

It ensures users only access what they are allowed to, protecting sensitive data and actions, improving security and user experience.

In NestJS, which decorator is commonly used to specify roles on a route?

A @Roles()

B @Auth()

C @Guard()

D @Access()

The @Roles() decorator is used to define which roles can access a route.

What does a RolesGuard do in NestJS?

A Manages database connections

B Encrypts user passwords

C Handles HTTP requests

D Checks if a user has the required roles to access a route

RolesGuard checks user roles against required roles for route access.

Which NestJS feature is best suited to block unauthorized access based on roles?

A Interceptors

B Middleware

C Guards

D Pipes

Guards are designed to control access and can check roles before route handlers run.

If a user does not have the required role, what should the RolesGuard do?

A Allow access anyway

B Throw an UnauthorizedException

C Log the user out

D Redirect to homepage

RolesGuard should throw an UnauthorizedException to block access.

Where do you usually store user roles for authorization checks?

A In the user object attached to the request

B In the request headers

C In the database only

D In the URL query parameters

User roles are typically attached to the user object in the request after authentication.

Explain how role-based authorization works in NestJS using guards and decorators.

Think about how you tell NestJS which roles can access a route and how it checks the user's roles.

Describe why role-based authorization is important for web app security and user experience.

Consider what happens if anyone could access everything without restrictions.