# Debugging with the AJAX Toolkit

The AJAX Toolkit provides a debugging window that pops up when certain errors are encountered.

You can invoke logging explicitly using the `log` method. For example, if you wanted to display the debugging window with the value of a variable at a certain point in your client application, you could add this line at the appropriate place:

```javascript
sforce.debug.log(myVar);
```

You can open the debugging window at any point by using this command:

```javascript
sforce.debug.open();
```