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When you say front-end code, do you mean views or JavaScript? The answer is different.

**Views** are the client-side code, but are generated server-side so you have access to things like `user_signed_in?` and `current_user`.

**JavaScript** has the QPixel JS API that you can use:

```js
const user = await QPixel.user();
if (!!user.error) {
  // not signed in or some error - handle it here,
  // else use the user object for whatever you need
}
```