Authentication and authorization are two key concepts in application security.
Authentication checks who a user is.
Authorization checks what a user is allowed to do.
Every secure application must correctly handle both to protect data and system features.
Authentication vs Authorization
Authentication:
- Verifies user identity
- Example: Login with username and password
Authorization:
- Controls user access
- Example: Only admins can delete data
Both work together to keep applications safe.
This example checks if the entered credentials are correct.
In real applications, authentication is handled securely on the server.
Here, only users with the role "admin" can delete data.
This protects important features from unauthorized access.
These examples show how authentication and authorization protect applications.
By understanding these basics, students gain the foundation to build secure, role-based JavaScript applications — a key requirement for professional and job-ready developers.