Angular 6: HttpErrorResponse SyntaxError: Unexpected token s in JSON

Question

I am posting a request and I am suppose to receive a 'success' string back as response. I am getting an HttpResponseError with the following information posted in the image below.

PurchaseOrderService

postPurchaseOrderCustom(purchaseOrderCustom: PurchaseOrderSaveCustom) {
 const url = `${this.localUrl}purchaseOrderCustom`;
 return this.http.post<String>(url, purchaseOrderCustom, {headers: this.header})
            .pipe(
                   catchError(this.handleError('postPurchaseOrderCustom', 'I am an error'))
                 );
  }

PurchaseOrderComponent

this.purchaseOrderService.postPurchaseOrderCustom(purchaseOrderCustom).subscribe( response => {
  console.log("Testing", response);
  },
  error => {
    console.error('errorMsg',error );   
  }

The way I am doing it is the same way its done in the documentation. Do point out to me what I am doing wrong.

Answer 1

This related to your api respond type ,success is not valid json format,by default HttpClient is expected json response type and try to parse it later . You can solve this by set the respond type to text like this

return this.http.post<String>(
    url,
    purchaseOrderCustom,
    { headers: this.header, responseType: 'text' }
)
    .pipe(
        catchError(this.handleError('postPurchaseOrderCustom', 'I am an error')
        ));