# AWS Systems Manager Construct Library
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This module is part of the [AWS Cloud Development Kit](https://github.com/aws/aws-cdk) project.

## Installation

Install the module:

```console
$ npm i @aws-cdk/aws-ssm
```

Import it into your code:

```ts nofixture
import * as ssm from '@aws-cdk/aws-ssm';
```

## Using existing SSM Parameters in your CDK app

You can reference existing SSM Parameter Store values that you want to use in
your CDK app by using `ssm.StringParameter.fromStringParameterAttributes`:

[using SSM parameter](test/integ.parameter-store-string.lit.ts)

## Creating new SSM Parameters in your CDK app

You can create either `ssm.StringParameter` or `ssm.StringListParameter`s in
a CDK app. These are public (not secret) values. Parameters of type
*SecureString* cannot be created directly from a CDK application; if you want
to provision secrets automatically, use Secrets Manager Secrets (see the
`@aws-cdk/aws-secretsmanager` package).

```ts
new ssm.StringParameter(this, 'Parameter', {
  allowedPattern: '.*',
  description: 'The value Foo',
  parameterName: 'FooParameter',
  stringValue: 'Foo',
  tier: ssm.ParameterTier.ADVANCED,
});
```

[creating SSM parameters](test/integ.parameter.lit.ts)

When specifying an `allowedPattern`, the values provided as string literals
are validated against the pattern and an exception is raised if a value
provided does not comply.