interceptor angular code example

Example 1: interceptor error handling angular 9

import { HttpEvent, HttpInterceptor, HttpHandler, HttpRequest, HttpErrorResponse } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { catchError } from 'rxjs/operators';
export class HttpErrorInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next.handle(request)
      .pipe(
        catchError((error: HttpErrorResponse) => {
          let errorMsg = '';
          if (error.error instanceof ErrorEvent) {
            console.log('this is client side error');
            errorMsg = `Error: ${error.error.message}`;
          }
          else {
            console.log('this is server side error');
            errorMsg = `Error Code: ${error.status},  Message: ${error.message}`;
          }
          console.log(errorMsg);
          return throwError(errorMsg);
        })
      )
  }
}

Example 2: http interceptor angular

// src/app/auth/auth.service.ts

import { Injectable } from '@angular/core';
import decode from 'jwt-decode';

@Injectable()
export class AuthService {  
  public getToken(): string {
    return localStorage.getItem('token');
  }  

	public isAuthenticated(): boolean {    
      // get the token
      const token = this.getToken();    
      // return a boolean reflecting 
      // whether or not the token is expired
      return tokenNotExpired(null, token);  
    }
}

// src/app/auth/token.interceptor.ts
import { Injectable } from '@angular/core';
import {
  HttpRequest,
  HttpHandler,
  HttpEvent,
  HttpInterceptor
} from '@angular/common/http';
import { AuthService } from './auth/auth.service';
import { Observable } from 'rxjs/Observable';
@Injectable()
export class TokenInterceptor implements HttpInterceptor {
  constructor(public auth: AuthService) {}
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    
    request = request.clone({
      setHeaders: {
        Authorization: `Bearer ${this.auth.getToken()}`
      }
    });
    return next.handle(request);
  }
}

// src/app/app.module.ts
import { HTTP_INTERCEPTORS } from '@angular/common/http';
import { TokenInterceptor } from './../auth/token.interceptor';

@NgModule({  bootstrap: [AppComponent],
          	 imports: [...],
			 providers: [
                       { 
                       provide: HTTP_INTERCEPTORS,
                       useClass: TokenInterceptor,
                       multi: true   
                       }  
          ]})
export class AppModule {}

Example 3: interceptor in angular 8

interface HttpInterceptor {
  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>>
}

Example 4: angularjs interceptor

// register the interceptor as a service
$provide.factory('myHttpInterceptor', function($q, dependency1, dependency2) {
  return {
    // optional method
    'request': function(config) {
      // do something on success
      return config;
    },

    // optional method
   'requestError': function(rejection) {
      // do something on error
      if (canRecover(rejection)) {
        return responseOrNewPromise
      }
      return $q.reject(rejection);
    },



    // optional method
    'response': function(response) {
      // do something on success
      return response;
    },

    // optional method
   'responseError': function(rejection) {
      // do something on error
      if (canRecover(rejection)) {
        return responseOrNewPromise
      }
      return $q.reject(rejection);
    }
  };
});

$httpProvider.interceptors.push('myHttpInterceptor');


// alternatively, register the interceptor via an anonymous factory
$httpProvider.interceptors.push(function($q, dependency1, dependency2) {
  return {
   'request': function(config) {
       // same as above
    },

    'response': function(response) {
       // same as above
    }
  };
});