python-terrascript/docs/tutorials/variable1/variable1.tf.json

{
  "provider": {
    "aws": [
      {
        "region": "us-east-1"
      }
    ]
  },
  "variable": {
    "image_id": {
      "type": "string"
    }
  },
  "resource": {
    "aws_instance": {
      "example": {
        "instance_type": "t2.micro",
        "ami": "${var.image_id}"
      }
    }
  }
}