---
title: README
emoji: 👀
colorFrom: blue
colorTo: red
sdk: static
pinned: false
---

<div style="background-color: #2717a1; color: #f8f7fe; border-radius: 8px; padding: 0.5rem 1rem; margin-bottom: 2rem; ">
  <span style="font-weight: 600;">Want to try out the dev mode on Hugging Face Spaces?</span> Use the "Request to join this org" button to join the waitlist.
</div>

<div style="background-color: rgb(255, 241, 209); color: rgb(90, 65, 0); border-radius: 8px; padding: 0.5rem 1rem; margin-bottom: 2rem; ">
  <span style="font-weight: 600;">WARNING:</span> This feature is still in an <span style="font-weight: 600;">alpha stage</span>.
  You should expect bugs and instabilities.
  If you encounter issues with Spaces dev mode, please report them in the <a href="/spaces/dev-mode-explorers/README/discussions">Community tab</a> of this Organization card 🤗
</div>

# Spaces Dev Mode (feature preview)

**Members of this organization have early access to the new "Dev Mode" feature on Spaces.**  

## About Dev Mode

When the "Dev mode" is enabled on Space, you can connect to it using SSH or VS Code.

You can make changes to your application code, run some debug tools, ...

![image/png](https://cdn-uploads.huggingface.co/production/uploads/5fcfb7c407408029ba3577e2/ME0eqODONxjInE9tfmTDc.png)

Changes reflect to your Space after you hit the "Refresh" button.

When you are done, you can persist your changes using `git` as you would normally do when developping locally.


## How to enable the dev mode

Go to your Space's settings and click on "Enable dev mode".

![image/png](https://cdn-uploads.huggingface.co/production/uploads/5fcfb7c407408029ba3577e2/QvLqvKxEzq8v0cpxQQ5An.png)

## Limitations

The dev mode is currently not available for static Spaces.

### Docker Spaces

Dev mode is supported for Docker Spaces. However, your Space needs to comply with the following rules for the Dev mode to work properly.

1. The following packages must be installed:

- `bash` (required to establish SSH connections)
- `curl`, `wget` and `procps` (required by the VS Code server process)
- `git` and `git-lfs` to be able to commit and push changes from your dev mode environment

2. Your application code must be located in the `/app` folder for the dev mode daemon to be able to detect changes.

3. The `/app` folder must be owned by the user with uid `1000` to allow you to make changes to the code.

4. The Dockerfile must contain a `CMD` instruction for startup. Checkout [Docker's documentation](https://docs.docker.com/reference/dockerfile/#cmd) about the `CMD` instruction for more details.

### Example of a compatible Dockerfile

This is an example of a Dockerfile compatible with Spaces dev mode.

It installs the required packages with `apt-get`, along with a couple more for developer convenience (namely: `top`, `vim` and `nano`).
It then starts a NodeJS application from `/app`.

```Dockerfile
FROM node:19-slim

RUN RUN apt-get update && \
    apt-get install -y \
      bash \
      git git-lfs \
      wget curl procps \
      htop vim nano && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /app
COPY --link --chown=1000 ./ /app
RUN  npm ci 

CMD ["node", "index.mjs"]
```