---
name: "up.Preview.prototype.params"
area: "API"
kind: "Property"
parent: "up.Preview class"
url: "https://unpoly.com/api/up.Preview.prototype.params"
---
<nav aria-label="Unpoly docs">[All docs](https://unpoly.com/index.md) · [up.Preview class](https://unpoly.com/api/up.Preview.md)</nav>

# up.Preview.prototype.params

Form data for the request being previewed.

See [Previewing form submissions](https://unpoly.com/learn/optimistic-rendering.md#previewing-form-submissions) for an example.

---

## Return value {#return-value}

Type: [up.Params](https://unpoly.com/api/up.Params.md)