AWS Cloudformation JSON parameters for EC2 instance

params.json

{
	"AWSTemplateFormatVersion": "2010-09-09",
	"Description": "Create a basic Amazon Linux Server",
	"Parameters": {
		"KeyName": {
			"Description": "Key Pair name",
			"Type": "AWS::EC2::KeyPair::KeyName",
			"Default": "keyPair"
		},
		"VPC": {
			"Description": "Select a VPC",
			"Type": "AWS::EC2::VPC::Id"
		},
		"Subnet": {
			"Description": "Select a subnet from the VPC",
			"Type": "AWS::EC2::Subnet::Id"
		},
		"InstanceType": {
			"Description": "Select one of the instance types",
			"Type": "String",
			"Default": "t2.micro",
			"AllowedValues": ["t2.micro", "t2.small", "t2.medium"]
		}