# Engine Mode

## Initiate Debugging

From VSCode; 

* Open a terminal window with `` CTRL+` ``  
* Switch to bash, if needed

```
npm run build
```

Open a second terminal pane, by clicking the split pane button. 

```
npm run serve
```

> Now the code is running locally

In the site, you can change the engine mode 

```
?engine.mode=dev
```

```
?engine.mode=prod
```