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I need your help to recommend me documents or links that solve my question. Actually in Angular 4, I want to customize error from api services. For example, if the server responses the request with error, the error will be shown to user. My question is how can I get all errors from server and for each ones write codes for user in front-end. Thank you in advance.

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  • link this could be helpful, I recommend that you should try to add specific error code in your backend (e.g spring @ExceptionHandler ) and in your front end You can try to use .catch((err: any) => { if(err.status == 'your code e.g 84573'){ console.error('An special error occurred coneccted to the business logic:', err.error); } }); This(more or less this) was working in angularjs - probably will work here too but i'm not 100% sure. Commented Feb 27, 2018 at 6:49
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    Possible duplicate of Catching errors in Angular HttpClient Commented Feb 27, 2018 at 7:20
  • @MacRyze thank you, it is so easy :) Commented Feb 27, 2018 at 7:24
  • @zgue thanks a lot, it is useful. Commented Feb 27, 2018 at 7:25

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You can make HTTP interceptor and collect all server error in single service and modify them according to your requirement.

This is one of the simplest implementation I have found https://hackernoon.com/global-http-request-error-catching-in-angular-486a319f59ab

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