Developing web applications can be a challenging task, and among the many issues we face, one of the most common ones is the repetitive API calls that occur every time a component initializes. This can lead to a great deal of pain and frustration, as well as excessive calls that can slow down the performance of your application.
But fear not, there is a strategy that can help you save multiple API hits for the same endpoint. By making use of an Interceptor in your Angular application, you can streamline your code and improve the overall efficiency of your web app.
In the code snippet below, we will demonstrate how to implement this strategy by simply mentioning the endpoints we want to cache and letting the interceptor do its job. This will not only save you time and energy, but also make your application more responsive and user-friendly.
So without further ado, letโs dive in and discover how to implement this powerful tool in your web development process.
Hereโs the code:
After the interceptor is created donโt forget to reference it in app.module.ts
Alright, lets catch the code explanation:
We have an Angular interceptor called ApiCacheInterceptor
that can cache HTTP responses from certain API endpoints. The interceptor uses the HttpInterceptor
class and its intercept()
method to handle all HTTP requests and responses.
When a request is intercepted, the interceptor checks if the request endpoint is in a predefined set of endpoints to cache. If the endpoint is in the set, the interceptor checks if the response is already cached. If the response is cached, the interceptor returns the cached response. If the response is not cached, the interceptor sends the request to the server, caches the response, and returns the response to the original caller.
The ApiCacheInterceptor
class defines two private properties: cache
, which is a Map
object that stores cached responses, and endpointsToCache
, which is a Set
object that lists the endpoints to cache. The intercept()
method uses these properties to implement the caching logic.
If you found this article informative and helpful, make sure to follow my account for more insightful and useful posts on various topics related to web development, technology, and much more. By following, youโll be the first to know about my latest articles, tips, and tricks, and stay up to date with the latest trends in the industry.
I am dedicated to providing high-quality content that is easy to understand and helpful for readers of all levels of expertise. Whether youโre a beginner or an experienced developer, youโll find my posts to be informative, engaging, and relevant to your interests.