# Jupyterlab User interface

## Testing out Jupyterlab

**Jupyterlab** is a new interface to interact with your Jupyter notebooks.
However, it is in very active development and undergoing constant changes. You
can read about its features [on the official
website](https://jupyterlab.readthedocs.io/en/stable/user/interface.html).

You can test it out on our server by using the following kind of URL, where
`$YOUR-USER` must be replaced by your PSI username. You must already have an
active session on the jupyterhub.

```text
https://merlin-jupyter.psi.ch:8000/user/$YOUR-USER/lab
```

## Switching to the Classic Notebook user interface

You can switch to the classical notebook UI by using the **"Launch Classic Notebook"** command from the left sidebar of JupyterLab.

![Launch Classic Notebook](../../images/jupyter/jupyter-launch-classic.png)
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## Jupyterlab does not support the older nbextensions

These regrettably are not yet supported from within the JupyterLab UI,
but you can activate them through the Classic Notebook interface (see
above)