ParseJsonResponse returns error based on status code

do.go

@@ -2,6 +2,7 @@ package ezhttp
 
 import (
 	"encoding/json"
+	"fmt"
 	"io"
 	"net/http"
 )
@@ -10,10 +11,28 @@ func Do(req *http.Request) (*http.Response, error) {
 	return http.DefaultClient.Do(req)
 }
 
-func ParseJsonResponse[T any](r io.Reader) (*T, error) {
+func ParseJsonResponse[T any](resp *http.Response) (*T, error) {
+	if resp.StatusCode/100 == 2 {
+		return nil, fmt.Errorf(
+			"request '%s' returned status code %s\nOutput: %s",
+			resp.Request.URL.String(),
+			resp.Status,
+			ReadAllString(resp.Body),
+		)
+	}
+
 	res := new(T)
-	if err := json.NewDecoder(r).Decode(res); err != nil {
+	if err := json.NewDecoder(resp.Body).Decode(res); err != nil {
 		return nil, err
 	}
 	return res, nil
 }
+
+func ReadAllString(r io.Reader) string {
+	data, err := io.ReadAll(r)
+	if err != nil {
+		return fmt.Errorf("could not read response body: %w", err).Error()
+	}
+
+	return string(data)
+}