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What is CanActivate() Method in angular routes with details understanding and examples

Hello Guys,

In this blog we are going to learn about CanActivate method in angular.

Angular is a highly capable framework for the web which enables the development of web apps that are both interactive and dynamic. A fundamental component of Angular is its capability to regulate access to particular portions of an application in accordance with a user's permissions or roles. Powering this feature is the CanActivate method, which is a native type of protection in Angular and ensures that routes are safeguarded.

Angular's CanActivate method can play a vital role in secure application development. Let's explore it further in this blog.

CanActivate, what is it? Angular's CanActivate interface is a guard that's quite handy when it comes to securing routes. With this interface, you can control who's got access to a particular route by checking if the user meets certain conditions. For example, you could require that the user is authenticated or has the right privileges before granting access. This is a great way to avoid unauthorised access to vital parts of your app. Implemented with a canActivate() method is the CanActivate interface, found within a class. Upon invocation, this method will return a boolean value or an Observable<boolean> or Promise<boolean>. Should the boolean evaluate true, the user may proceed to access the desired route. If false is returned, the user is immediately rerouted to another destination, such as the login page.

How to use CanActivate?

To use CanActivate effectively, you should have a clear understanding of its functionalities. One way to achieve this is by creating an instance of CanActivate and implementing its canActivate method. From there, you can control access to certain routes and components by checking if the user is authorized to view them. It's also important to note that CanActivate can be used in conjunction with other guards, such as CanActivateChild and CanLoad, to provide even more specific access control. So don't be afraid to experiment with different combinations of guards to find the best fit for your specific needs. Running the following command using the Angular CLI will create a guard that implements the CanActivate interface for use with the CanActivate method in Angular.
ng generate guard guardName
The CanActivate interface can be utilized to create a unique guard. By defining the conditions necessary for the route to activate within the canActivate() method of the guard class, a new guard named guardName is produced. If we are looking to safeguard a path that demands authentication, we have the option of utilizing the canActivate() function in the following manner:



Using authService, the canActivate() function verifies the user's authentication in our hypothetical case. When a user is authenticated, the function approves the route by returning true. However, if the user has not been authenticated, the function blocks the route from activation by returning false while redirecting the user to the router.navigate() function that takes them to the login page.

We can then use the guardName guard to protect a route by adding it to the canActivate property in the route definition:



This will ensure that the guardName guard is applied to the protected route, and the canActivate() method is called to determine whether the route can be activated.


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