angular_interceptor.js

import {Injectable} from '@angular/core';
import {
  HttpRequest,
  HttpHandler,
  HttpEvent,
  HttpInterceptor
} from '@angular/common/http';
import {Observable} from 'rxjs';
import {tap} from "rxjs/operators";
import {AuthService} from "./auth.service";

@Injectable()
export class ApiInterceptor implements HttpInterceptor {

  constructor(public auth: AuthService) {
  }

  intercept(req: HttpRequest<unknown>, next: HttpHandler): Observable<HttpEvent<unknown>> {
    req = req.clone({
      setHeaders: {
        Authorization: `Bearer ${this.auth.getToken()}`
      }
    });

    return next.handle(req).pipe(
      tap(x => x, err => {
        // Handle this err
        console.error(`Error performing request, status code = ${err.status}`);
      })
    );
  }
}