[id='server_script_metdata']
= Script Metadata
Metadata provides additional information about scripts that {brandname} servers use when running scripts.

Script metadata are `property=value` pairs that you add to comments in the
first lines of scripts, such as the following example:

[source,javascript]
----
// name=test, language=javascript
// mode=local, parameters=[a,b,c]
----

* Use comment styles that match the scripting language (`//`, `;;`, `#`).
* Separate `property=value` pairs with commas.
* Separate values with single (') or double (") quote characters.

.Metadata Properties

|===
|Property |Description

|`mode`
|Defines the exection mode and has the following values:

`local` only the node that handles the request executes the script. Although
scripts can still invoke clustered operations.

`distributed` {brandname} uses clustered executors to run scripts across nodes.

|`language`
|Specifies the ScriptEngine that executes the script.

|`extension`
|Specifies filename extensions as an alternative method to set the ScriptEngine.

|`role`
|Specifies roles that users must have to execute scripts.

|`parameters`
|Specifies an array of valid parameter names for this script. Invocations which specify parameters not included in this list cause exceptions.

|`datatype`
|Optionally sets the MediaType (MIME type) for storing data as well as
parameter and return values. This property is useful for remote clients that
support particular data formats only.

Currently you can set only `text/plain; charset=utf-8` to use the String UTF-8
format for data.
|===
