> For the complete documentation index, see [llms.txt](https://docs.ondiagram.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ondiagram.com/nodes/mapper.md).

# Mapper

## General

The `Mapper` node can be used to easily map from one data type to another. All functionality of this node can also be done with link mapping. 

{% hint style="info" %}
For more complex transformation the `Code` node can be used.
{% endhint %}

## Input

* **Source:** Receives an `Object` or a value type eg. `String`, `Number` or `Boolean` with the values to map. Learn more on [object-mapper](https://www.npmjs.com/package/object-mapper).

*Examples:*

* Object ➡ Object 

`"bar.foo": "baz"` & `{"baz": {"foo": "*value*"}}` ➡ `` {"baz": "*value*"}` ``

* Object ➡ Value 

`"foo[0].bar"` & `{"foo": [{"bar: *value*"}]}` ➡ `*value*`

* Value ➡ Object 

`*value*` & `"foo[0].bar"` ➡ `{"foo": [{"bar: *value*"}]}`

## Output

* **Out:** Returns an `Object` or a value type eg. `String`, `Number` or `Boolean` with the mapped values. Learn more on [object-mapper](https://www.npmjs.com/package/object-mapper).

## Use Cases

Register a user to a database.

* Request (Post) ➡ Mapper (Get) ➡ Response (200)


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