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These are methods and properties available on the figma.parameters global object. See Accepting Parameters as Input for more details.

type ParameterInputEvent<T = ParameterValues> = {
query: string,
key: string,
parameters: Partial<T>,
result: SuggestionResults,

The input event is fired on every key press as the user is entering parameters for a plugin in quick actions. The expectation is that plugin will respond to these events by calling one of the APIs result object.

on(type: 'input', callback: (event: ParameterInputEvent) => void): void

Register a handler for user input events in the quick action UI.

once(type: 'input', callback: (event: ParameterInputEvent) => void): void

Register a handler for user input events in the quick action UI. Same as figma.parameters.on("input"), but only gets called the first time.

off(type: 'input', callback: (event: ParameterInputEvent) => void): void

Removes a handler added via figma.parameters.on.


The result object passed to the 'input' event handler contains API for controlling the UI that the user sees while entering parameter values. Most importantly it is able to provide the list of autocomplete suggestions that the user can choose from as they type.

But the result object also enables showing error messages and loading states.

setSuggestions(suggestions: Array<string | { name: string; data?: any; icon?: string | Uint8Array; iconUrl?: string }>): void

Sets the list of autocomplete suggestions to be displayed in the quick action UI.

If you only want to provide a string suggestion, and don't need metadata or icons, you can use an array of simple string values. For example

Simple string suggestions
figma.parameters.on('input', ({ query, result }) => {
["Armadillo", "Baboon", "Cacatua", "Dolphin"]
.filter(s => s.includes(query)))

However the API also allows providing more information with each suggestion:

  • The text to display to the user
  • An icon (optional)
  • Hidden metadata which is passed back to the plugin if the user chooses this suggestion (optional)


Suggestions with icons and data
{ name:, data:, icon: node1Preview },
{ name:, data:, icon: node2Preview },

The name property contains the text to display to the user in the autocomplete suggestions. This property is required.

The data property allows associating hidden metadata with a given autocomplete suggestion. This data is passed back to the plugin as the parameter's value if the user chooses this option. If no data property is provided, it defaults to the value of the name property. I.e. the value of the parameter will be the string that was displayed to the user.

An icon can be provided through a icon or iconUrl property. The icon property can contain either a raster image in the form of a Uint8Array, or an SVG image in the form of a string. You can alternatively use the iconUrl property to provide a URL to the image. Note that for this to work the target server has to support CORS.

setError(message: string): void

Displays an error message to the user instead of a list of autocomplete suggestions. When this function is called, the user is prevented from moving on to the next parameter without first changing the input for the current parameter.

This is useful to signal to the user that they have entered an invalid value and provide them instruction for how to correct the input.

You can also use this as a way to validate pre-conditions, like current selection, or some state of the current document. To do this, in the 'input' event handler for the first parameter key, check the that all pre-conditions are fulfilled and call setError with an appropriate error message if they are not, unconditionally of what the current query value is.

This function is not available on parameters with allowFreeform set. The purpose of allowFreeform is to allow users to enter arbitrary values and so Figma doesn't guarantee that the plugin gets an opportunity to handle an input event and call setError before the user moves on to the next parameter.

If you want to generally allow freeform input, but still retain the ability to call setError, you can remove allowFreeform and manually add a autocomplete entry containing the current query string. I.e. make the first item in the array passed to setSuggestions simply be the string in query.

For a full example of what this can look like, see the Resizer sample plugin

setLoadingMessage(message: string): void

Modify the default "Loading Suggestions..." message displayed until the plugin calls setSuggestions. This can be useful if your plugin needs to load autocomplete messages from the network, or if you need to perform lengthy calculations.

You can call setLoadingMessage multiple times in order to provide an updated message.


interface ParameterValues {
[key: string]: any

ParameterValues is the type used to pass values for parameters into plugins. It's a mapping from parameter keys, which come from the manifest, to the value that the user typed or chose in the autocomplete suggestions. Depending on how your plugin specified the suggestion when calling setSuggestions the value will resolve to:

  • Suggestion's data property if sepecified
  • Suggestion's name property
  • The suggestion itself if a string was passed as the suggestion.
  • Query string for freeform parameters
  • undefined for optional parameters that were skipped.