Sample DynamoDB policy

sample-policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "dynamodb:GetItem",
                "dynamodb:PutItem",
                "dynamodb:Query"
            ],
            "Resource": [
                "arn:aws:dynamodb:<YOUR_REGION>:<YOUR_AWS_ACCOUNT_ID>:table/<YOUR DYNAMODB_TABLE>"
            ],
            "Condition": {
                "ForAllValues:StringEquals": {
                    "dynamodb:LeadingKeys": [
                        "${cognito-identity.amazonaws.com:sub}"
                    ]
                }
            }
        }
    ]
}