> For the complete documentation index, see [llms.txt](https://docs.onum.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.onum.com/the-workspace/pipelines/actions/transformation/field-transformation/field-transformation-operations/compression/zlib-decompress.md).

# Zlib Decompress

## Description

This operation takes base64/hex-encoded zlib-compressed data as input, decodes it, decompresses it using the zlib algorithm, and returns the original uncompressed data as a string.

***

## Data types

These are the input/output expected data types for this operation:

### Input data

![](/files/lPHCVhp93aYrWgLIlhNp) - Base64-encoded zlib-compressed data.

### Output data

![](/files/lPHCVhp93aYrWgLIlhNp) - Decompressed original data

***

## Parameters

These are the parameters you need to configure to use this operation (mandatory parameters are marked with a <mark style="color:red;">**\***</mark>):

<details>

<summary>Input Format</summary>

Choose the input format of your data between **Base64** (default) or **Hex**.

</details>

***

## Example

Suppose you want to **decompress** a series of strings that have been compressed using the **Zlib compression algorithm**. To do it:

1. In your Pipeline, open the required [Action](/the-workspace/pipelines/actions.md) configuration and select the input **Field**.
2. In the **Operation** field, choose **Zlib Decompress**.
3. Set **Input Format** as **Base64**.
4. Give your **Output field** a name and click **Save**. You'll get the division results. For example:

```
eJzySM3JyVcozy/KSQEEAAuUAw0= -> Hello, World!
```

{% hint style="info" %}
You can try out operations with specific values using the **Input** field above the operation. You can enter the value in the example above and check the result in the **Output** field.
{% endhint %}


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