How to avoid multiple api calls in angular

We can avoid calling multiple API services with the help of shareReplay method of RxJS. shareReplay subscribes the observable, caches the response and multicasts it to all the subscribers without calling the API multiple times.

1. How to hide API calls from network in Angular?
2. What is the use of shareReplay in angular?
3. How do I stop multiple API calls?
4. How can I make API call only once?
5. How to call service only once in angular?
6. How do you handle a large number of API calls?
7. Can I use more than 1 API?
8. Can you use 2 APIs?
9. Why is my API getting called multiple times?
10. How do you handle millions of API requests?
11. How many API calls is too many?

How to hide API calls from network in Angular?

You can't hide api calls from network tab but you can do a trick with signalR /websocket to minimize visible API calls. You will need to create "Get" "Post" etc method at server side and call them from client and pass data. I would suggest to use this workaround only for APIs having less data transfer.

What is the use of shareReplay in angular?

You generally want to use shareReplay when you have side-effects or taxing computations that you do not wish to be executed amongst multiple subscribers. It may also be valuable in situations where you know you will have late subscribers to a stream that needs access to previously emitted values.

How do I stop multiple API calls?

We can avoid calling multiple API services with the help of shareReplay method of RxJS. shareReplay subscribes the observable, caches the response and multicasts it to all the subscribers without calling the API multiple times. Lets see the above example with shareReplay.

How can I make API call only once?

Using Functional Components

Similar to componentDidMount , useEffect hook with empty dependencies array can be used to make an API call only once after the initial render.

How to call service only once in angular?

Providing a singleton servicelink

There are two ways to make a service a singleton in Angular: Set the providedIn property of the @Injectable() to "root" Include the service in the AppModule or in a module that is only imported by the AppModule.

How do you handle a large number of API calls?

Chunked transfers are one way to send API responses in not just a single API response, but break it down into an appropriate number of chunks, and send them in order. API consumers can make a request and receive large volumes of data in separate chunks that are reassembled on the client side.

Can I use more than 1 API?

To answer your question, yes it is normal to have several microservices (small APIs) working together in a solution. It's a valid design decision, but the flexibility you get from microservices does come at a price.

Can you use 2 APIs?

Yes, this can also be referred as integrations from one API to another API in order to offer combined services. e.g. - Nexmo (SMS API) (Disclaimer: I work for this company) integrated to Mailchimp (Email List and Campaign management service) to allow Mailchimp users to send SMS campaigns to their subscribers.

Why is my API getting called multiple times?

Duplicate API Requests: Possible Reasons

There can be different scenarios where an API is called multiple times to get the data. For example, When a user taps on a button multiple times before it gets disabled. At times, one API response causes another API request to execute.

How do you handle millions of API requests?

To handle 'millions of request' the system must be deployed on multiple web servers behind a load-balancer that would round robin between each. if the system is hitting a datastore, a second level cache(ehcache, memcache,etc.) should be used to reduce load on the datastore.

How many API calls is too many?

But in most cases our servers will reject API requests from a particular application if the request rate exceeds 30 API requests per minute. In this case the client will get an HTTP error with status code 429 “too many requests”.