Role-based access control in Express - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Role-based Access Control (RBAC)?

RBAC is a way to control who can do what in an app by assigning roles to users. Each role has permissions that allow or block actions.

beginner

How do you check a user's role in Express middleware?

You create middleware that looks at the user's role stored in the request (like req.user.role) and decides if they can continue or get blocked.

intermediate

Why use middleware for RBAC in Express?

Middleware lets you check permissions before your route runs. This keeps your code clean and secure by stopping unauthorized users early.

beginner

What happens if a user tries to access a route without the right role?

The middleware sends a response like 403 Forbidden, telling the user they don’t have permission to access that resource.

intermediate

How can roles be stored and accessed in an Express app?

Roles can be stored in the user’s session, JWT token, or database. When a request comes in, middleware reads the role from these places to check permissions.

In Express, where is the best place to check user roles for access control?

A Inside route handlers

B In middleware functions

C In the database query

D In the client-side code

Middleware runs before route handlers and is the best place to check roles and permissions to block unauthorized access early.

What HTTP status code should you send when a user is not allowed to access a resource due to role restrictions?

A 200 OK

B 404 Not Found

C 401 Unauthorized

D 403 Forbidden

403 Forbidden means the user is authenticated but does not have permission to access the resource.

Which of these is NOT a common way to store user roles in an Express app?

A Local storage on client

B User session

C JWT token

D Database

Local storage on the client is not secure for storing roles because it can be modified by the user.

What is the main benefit of using RBAC in your Express app?

A Controls access based on user roles

B Simplifies user interface design

C Faster database queries

D Improves server performance

RBAC helps control what users can do by assigning roles with specific permissions.

If a user has the role 'admin', what should your RBAC middleware do?

A Ignore the role and allow all users

B Always block access

C Allow access to admin-only routes

D Redirect to login page

Admins usually have permission to access special routes, so middleware should allow them.

Explain how you would implement role-based access control in an Express app using middleware.

Think about how middleware can stop or allow requests based on user roles.

Describe why role-based access control is important for web applications.

Consider what happens if everyone could do everything in an app.