# Mappable parameters

Mappable parameters can either be filled in by the user or mapped from previous modules.

Mappable parameters use [parameters syntax](/custom-apps-documentation/block-elements/parameters.md).

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```json
[
	{
		"name": "email",
		"type": "email",
		"label": "Email address",
		"required": true
	},
	{
		"name": "name",
		"type": "text",
		"label": "Name",
		"required": true
	},
	{
		"name": "newsletter",
		"type": "boolean",
		"label": "Send newsletter?",
		"default": false,
		"required": true
	},
	{
		"name": "size",
		"type": "select",
		"label": "T-Shirt size",
		"options": [
			{
				"label": "S",
				"value": "s"
			},
			{
				"label": "M",
				"value": "m"
			},
			{
				"label": "L",
				"value": "l"
			}
		]
	}
]
```

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You can use [Remote Procedure Calls (RPCs)](/custom-apps-documentation/app-components/rpcs/dynamic-fields-rpc.md) to generate parameters dynamically.

Learn more about [best practices regarding mappable parameters](/custom-apps-documentation/best-practices/input-parameters/mappable-parameters.md).


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