---
title: experimental.preview() function
description: >
  `experimental.preview()` limits the number of rows and tables in the stream.
menu:
  flux_v0_ref:
    name: experimental.preview
    parent: experimental
    identifier: experimental/preview
weight: 101
flux/v0/tags: [transformations]
introduced: 0.167.0
---

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`experimental.preview()` limits the number of rows and tables in the stream.

Included group keys are not deterministic and depends on the order
that the engine sends them.

##### Function type signature

```js
(<-tables: stream[A], ?nrows: int, ?ntables: int) => stream[A] where A: Record
```

{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}

## Parameters

### nrows

Maximum number of rows per table to return. Default is `5`.



### ntables

Maximum number of tables to return.
Default is `5`.



### tables

Input data. Default is piped-forward data (`<-`).




## Examples

### Preview data output

```js
import "experimental"
import "sampledata"

sampledata.int()
    |> experimental.preview()

```