Use GetParameterHistory with an Amazon SDK or CLI

To get a value history for a parameter

The following get-parameter-history example lists the history of changes for the specified parameter, including its value.

aws ssm get-parameter-history \
    --name "MyStringParameter"

Output:

{
    "Parameters": [
        {
            "Name": "MyStringParameter",
            "Type": "String",
            "LastModifiedDate": 1582154711.976,
            "LastModifiedUser": "arn:aws:iam::111222333444:user/Mary-Major",
            "Description": "This is the first version of my String parameter",
            "Value": "Veni",
            "Version": 1,
            "Labels": [],
            "Tier": "Standard",
            "Policies": []
        },
        {
            "Name": "MyStringParameter",
            "Type": "String",
            "LastModifiedDate": 1582156093.471,
            "LastModifiedUser": "arn:aws:iam::111222333444:user/Mary-Major",
            "Description": "This is the second version of my String parameter",
            "Value": "Vidi",
            "Version": 2,
            "Labels": [],
            "Tier": "Standard",
            "Policies": []
        },
        {
            "Name": "MyStringParameter",
            "Type": "String",
            "LastModifiedDate": 1582156117.545,
            "LastModifiedUser": "arn:aws:iam::111222333444:user/Mary-Major",
            "Description": "This is the third version of my String parameter",
            "Value": "Vici",
            "Version": 3,
            "Labels": [],
            "Tier": "Standard",
            "Policies": []
        }
    ]
}

For more information, see Working with parameter versions in the Amazon Systems Manager User Guide.

Example 1: This example lists the value history for a parameter.

Get-SSMParameterHistory -Name "Welcome"

Output:

Description      :
KeyId            :
LastModifiedDate : 3/3/2017 6:55:25 PM
LastModifiedUser : arn:aws:iam::123456789012:user/admin
Name             : Welcome
Type             : String
Value            : helloWorld