fix(client): decode json string data payloads

internal/client/client.go

@@ -138,7 +138,7 @@ func (c *Client) Do(method, path string, body interface{}, query url.Values) (*o
 	if dataStr, ok := raw["data"].(string); ok {
 		var parsedData interface{}
 		if err := json.Unmarshal([]byte(dataStr), &parsedData); err == nil {
-			raw["data"] = json.RawMessage(dataStr)
+			raw["data"] = parsedData
 		}
 	}
 

internal/client/client_test.go

@@ -187,6 +187,35 @@ func TestClientDoStatusZero(t *testing.T) {
 	}
 }
 
+func TestClientDoParsesJSONStringData(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.Write([]byte(`{"status":0,"data":"[{\"id\":1,\"name\":\"demo\"}]"}`))
+	}))
+	defer server.Close()
+
+	c := &Client{HTTP: server.Client(), BaseURL: server.URL}
+	env, err := c.Do("GET", "/api/test", nil, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	raw, ok := env.Data.(map[string]interface{})
+	if !ok {
+		t.Fatalf("Data = %T, want map[string]interface{}", env.Data)
+	}
+	items, ok := raw["data"].([]interface{})
+	if !ok {
+		t.Fatalf("nested data = %T, want []interface{}", raw["data"])
+	}
+	if len(items) != 1 {
+		t.Fatalf("expected one parsed item, got %d", len(items))
+	}
+	item, ok := items[0].(map[string]interface{})
+	if !ok || item["name"] != "demo" {
+		t.Fatalf("unexpected parsed item: %#v", items[0])
+	}
+}
+
 func TestClientDoPaginationMeta(t *testing.T) {
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")