What is Interceptor in Angular

Angular is an open-source, client-side framework designed for building intuitive web applications. Based on TypeScript, this programming language allows developers to create cross-platform apps that you can use on different operating systems and devices.

With a successful history, the language continues to rule the web app development arena due to the versatility and flexibility it offers to developers. Whether you’re an experienced or a budding Angular developer, you must have heard of interceptors.

The article provides you with in-depth information about Angular and interceptors that developers use while handling HTTP requests.

Best Angular Interceptors and Why We Use Them?

Interceptors provide a platform to intercept incoming responses or outgoing requests. In simple terms, it is a mechanism that connects the front-end and the back-end applications. When an HTTP request is made, the interceptor manages and handles it for smooth accomplishment.

Before you get started, it’s important to learn how to create an interceptor. You can have a look at the angular interceptor example to understand how it works in detail.

There are many ways to use interceptor in Angular and some of the most common methods are mentioned herein.


Angular HTTP Interceptor helps change the URLs in a seamless manner. When you change the website URL, the interceptor behaves like an API interceptor that adds prefixes to the URL.


When multiple active requests are made, the interceptor serves as a loader to handle different requests effectively. The hide and show features are utilized to handle the request.


Angular HTTP interceptor is capable of changing or converting the API format. For example, it can convert the XML format to JSON so that the browser can process it efficiently.


The interceptors are multi-tasking components that can display a message as a notification. So, when you see a notification on your computer, tablet, or smartphone, know that an interceptor is at work.


We all know, authentication aims at verifying user identity. During angular login, the interceptor connects various parameters such as the bearer token and refresh token to redirect to the login URL.


Interceptors can request and respond instantaneously. Angular HTTP interceptors log the HTTP operation with no time lags, making it easier to record the time of request and response operations.


To detect errors, the angular interceptors work in two different ways – retrying HTTP calls and keeping a check on the status of the exception that occurred recently.

When working with Angular, it’s worth noting that you must never use angular local storage to store sensitive data. Any code in the browser can easily access the local storage unless it is formatted as JSON. There are many similar tips and tricks about Angular that are important to keep in mind while developing Angular applications.


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