# How to apply jupyter server extension on TLJH?

**URL:** <https://discourse.jupyter.org/t/how-to-apply-jupyter-server-extension-on-tljh/13260>\
**Category:** The Littlest JupyterHub\
**Tags:** jupyterhub, how-to, nteract\
**Created:** [March 4, 2022, 4:47pm UTC](https://discourse.jupyter.org/t/how-to-apply-jupyter-server-extension-on-tljh/13260 "2022-03-04T16:47:47Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![kaminion](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/kaminion/32/6628_2.png) [@kaminion](https://discourse.jupyter.org/u/kaminion)\
**Post date:** [March 4, 2022, 4:47pm UTC](https://discourse.jupyter.org/t/how-to-apply-jupyter-server-extension-on-tljh/13260/1 "2022-03-04T16:47:47Z")

</div>

Hi.

I want apply jupyter server extension TLJH, but It doesn’t work  
If I run `jupyter server extension list` I get the below output

> nteract\_on\_jupyter enabled
> 
> - Validating…  
> nteract\_on\_jupyter 2.15.1 OK

I make jupyterhub\_config.py

```python
export JUPYTERHUB_SINGLEUSER_APP='jupyter_server.serverapp.ServerApp'

```

but It’s not solve the problem.  
server response message is Bad Gateway.

I going to apply module is nteract\_on\_jupyter

> <https://github.com/nteract/nteract/tree/main/applications/jupyter-extension>
>
> //github.com/nteract/nteract/tree/main/applications/jupyter-extension