How to use class based HTTP interceptors in Angular 18?

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In this tutorial, I walked through the process of using class-based HTTP interceptors in Angular 18, highlighting their role in managing HTTP requests and responses globally. I started by explaining what interceptors are and their common use cases like adding headers, handling errors, and logging. Then, I demonstrated how to generate a class-based interceptor by running a specific command, emphasizing the need to set the functional flag to false to opt for class-based over the default functional interceptors. After generating an interceptor and a service, I showed how to inject the service into the interceptor, utilize it to get a token, and modify the request headers with this token. Finally, I covered registering the interceptor in the app module and testing it, alongside handling common errors such as the missing HTTP client provider.

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Chapters:
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00:00 Introduction to class-based HTTP interceptors in Angular 18
00:36 Generating an Interceptor
01:50 Implementing the Interceptor
03:44 Registering the Interceptor
04:23 Testing the Interceptor
06:16 Fixing the HTTP client provider error
06:52 Enabling dependency injection for the Interceptor
07:28 Inspecting the request headers

#Angular18 #HTTPInterceptors #WebDevelopment

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[manirathinammohan]

I have multiple HTTP services and need to use multiple interceptors. How can we implement this? How can we identify which service is using which interceptor?

[persianrom]

Hi, Its cool, but could you please say how to error handling when backend off ? like internet connection error ! Appreciate

[jhonnybif]

Thnks my bro, it's very useful e crisp, congratulations

[maneshwam]

Nice. short and crisp. BTW, what is the difference/advantages of creating class based interceptor instead of functional?