This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).
# AWS::EC2::Instance AssociationParameter

Specifies input parameter values for an SSM document in AWS Systems Manager.
`AssociationParameter` is a property of the [SsmAssociation](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-instance-ssmassociation.html) property type.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "[Key](#cfn-ec2-instance-associationparameter-key)" : {{String}},
 "[Value](#cfn-ec2-instance-associationparameter-value)" : {{[ String, ... ]}}
}
```
### YAML

```
 [Key](#cfn-ec2-instance-associationparameter-key): {{String}}
 [Value](#cfn-ec2-instance-associationparameter-value): {{
 - String}}
```
## Properties

`Key` 
The name of an input parameter that is in the associated SSM document. 
*Required*: Yes 
*Type*: String 
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)
`Value` 
The value of an input parameter. 
*Required*: Yes 
*Type*: Array of String 
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