> 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/constant.md).

# Constant

## General

The `Constants` node can be used to defined helper constants. This is usually useful to either utilise and query a database with or an external endpoint or return as part of an HTTP response.

## Input

* The `Constants` node has no input.

## Output

* **Out:** Returns an `Object` with the constants key-value params or an `Array` with `Object`, `String`, `Number` or `Boolean`. When there is ambiguity both options are shown on the right to pick the correct one.

## Use Cases

Return a static message to the user.

* Request (Get) ➡ Constants ➡ Response (200)


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