auth-interceptor.ts

@Injectable()
export class AuthInterceptor implements HttpInterceptor {
    constructor(private authService: AuthService) { }

    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        if (this.authService.isAuthenticated()) {
            const accessToken = JSON.parse(this.authService.getToken()).access_token;
            const token = `Bearer ${accessToken}`;
            const authReq = req.clone({ headers: req.headers.set("Authorization", token) });
            return next.handle(authReq) as any;
        }

        return next.handle(req) as any;
    }
}