> For the complete documentation index, see [llms.txt](https://doc.lockerprotocol.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.lockerprotocol.com/vault/dev-mode.md).

# Developer mode

What it turns on, and why it is not for real funds.

Developer mode exists for people building and testing Locker Protocol. **The Vault you install from `vault.lockerprotocol.com` has it off, and there is no switch in the app to turn it on.**

What it changes: with developer mode on, the **Sign** tab offers **Paste JSON** next to **Scan QR Code**, so a developer can feed a signing request without a camera. The shipped Vault is *scan-only*, because a QR code is the only transport an air-gapped device should accept.

<figure><img src="https://3674012151-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FT2jyfPJ4rcVavAvTU9nL%2Fuploads%2Fgit-blob-1bcacf6597a45ba8bd9dcc146def3cfdc5e29fa6%2F01-dev-toggle.png?alt=media" alt="paste json option"><figcaption><p>The Paste JSON option, visible only in developer mode.</p></figcaption></figure>

For developers: the flag is the build default (`environment.devMode`), overridable per device with the `locker_dev_mode` key in local storage (`on` / `off`).

{% hint style="warning" %}
**Never keep real funds on a Vault in developer mode.** The paste path bypasses the camera-only design. If support ever asks you to turn it on, turn it off again as soon as you are done.
{% endhint %}


---

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