> ## Documentation Index
> Fetch the complete documentation index at: https://docs.burn0.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# burn0 connect

> Add your API key

# burn0 connect

Adds or updates your burn0 API key.

```bash theme={null}
npx burn0 connect
```

## What it does

1. Prompts for your API key (paste, get one free, or skip)
2. Writes `BURN0_API_KEY` to your `.env` file
3. Adds `.env` to `.gitignore` if missing

## When to use

* You skipped the API key during `burn0 init`
* You want to switch to a different API key
* You're setting up an existing project that already has burn0

## API key format

Keys start with `b0_sk_` followed by 32 hex characters:

```
b0_sk_a1b2c3d4e5f6a1b2c3d4e5f6a1b2c3d4
```

Get a free key at [burn0.dev/dashboard/keys](https://burn0.dev/dashboard/keys).