====Substitutions====

You can use **substitutions** to use variable values (such as information about the server, folders, or parameters to the API function) in your settings.

To substitute, place the name of a variable between square brackets. For example, '[ROOT]' becomes the name of the folder where your function keeps its data files.

Each of your property values are available via their 'tag' name. For example, a property with the tag 'message' could be used with the following...

<code>
http://send.my.message/api?content=[message]
</code>

===Built-In Variables===

^Variable^Content^
|ROOT|The folder that contains the function files|
|SERVER|The host name of the server|

===Using===

These are mostly used in your [[creating_a_custom_function|info.json file]].