# Source: https://docs.comfy.org/custom-nodes/js/javascript_settings.md

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Settings

You can provide a settings object to ComfyUI that will show up when the user
opens the ComfyUI settings panel.

## Basic operation

### Add a setting

```javascript  theme={null}
import { app } from "../../scripts/app.js";

app.registerExtension({
    name: "My Extension",
    settings: [
        {
            id: "example.boolean",
            name: "Example boolean setting",
            type: "boolean",
            defaultValue: false,
        },
    ],
});
```

The `id` must be unique across all extensions and will be used to fetch values.

If you do not [provide a category](#categories), then the `id` will be split by
`.` to determine where it appears in the settings panel.

* If your `id` doesn't contain any `.` then it will appear in the "Other"
  category and your `id` will be used as the section heading.
* If your `id` contains at least one `.` then the leftmost part will be used
  as the setting category and the second part will be used as the section
  heading. Any further parts are ignored.

### Read a setting

```javascript  theme={null}
import { app } from "../../scripts/app.js";

if (app.extensionManager.setting.get('example.boolean')) {
    console.log("Setting is enabled.");
} else {
    console.log("Setting is disabled.");
}
```

### React to changes

The `onChange()` event handler will be called as soon as the user changes the
setting in the settings panel.

This will also be called when the extension is registered, on every page load.

```javascript  theme={null}
{
    id: "example.boolean",
    name: "Example boolean setting",
    type: "boolean",
    defaultValue: false,
    onChange: (newVal, oldVal) => {
        console.log(`Setting was changed from ${oldVal} to ${newVal}`);
    },
}
```

### Write a setting

```javascript  theme={null}
import { app } from "../../scripts/app.js";

try {
    await app.extensionManager.setting.set("example.boolean", true);
} catch (error) {
    console.error(`Error changing setting: ${error}`);
}
```

### Extra configuration

The setting types are based on [PrimeVue](https://primevue.org/) components.
Props described in the PrimeVue documentation can be defined for ComfyUI
settings by adding them in an `attrs` field.

For instance, this adds increment/decrement buttons to a number input:

```javascript  theme={null}
{
    id: "example.number",
    name: "Example number setting",
    type: "number",
    defaultValue: 0,
    attrs: {
        showButtons: true,
    },
    onChange: (newVal, oldVal) => {
        console.log(`Setting was changed from ${oldVal} to ${newVal}`);
    },
}
```

## Types

### Boolean

This shows an on/off toggle.

Based on the [ToggleSwitch PrimeVue
component](https://primevue.org/toggleswitch/).

```javascript  theme={null}
{
    id: "example.boolean",
    name: "Example boolean setting",
    type: "boolean",
    defaultValue: false,
    onChange: (newVal, oldVal) => {
        console.log(`Setting was changed from ${oldVal} to ${newVal}`);
    },
}
```

### Text

This is freeform text.

Based on the [InputText PrimeVue component](https://primevue.org/inputtext/).

```javascript  theme={null}
{
    id: "example.text",
    name: "Example text setting",
    type: "text",
    defaultValue: "Foo",
    onChange: (newVal, oldVal) => {
        console.log(`Setting was changed from ${oldVal} to ${newVal}`);
    },
}
```

### Number

This for entering numbers.

To allow decimal places, set the `maxFractionDigits` attribute to a number greater than zero.

Based on the [InputNumber PrimeVue
component](https://primevue.org/inputnumber/).

```javascript  theme={null}
{
    id: "example.number",
    name: "Example number setting",
    type: "number",
    defaultValue: 42,
    attrs: {
        showButtons: true,
        maxFractionDigits: 1,
    },
    onChange: (newVal, oldVal) => {
        console.log(`Setting was changed from ${oldVal} to ${newVal}`);
    },
}
```

### Slider

This lets the user enter a number directly or via a slider.

Based on the [Slider PrimeVue component](https://primevue.org/slider/). Ranges
are not supported.

```javascript  theme={null}
{
    id: "example.slider",
    name: "Example slider setting",
    type: "slider",
    attrs: {
        min: -10,
        max: 10,
        step: 0.5,
    },
    defaultValue: 0,
    onChange: (newVal, oldVal) => {
        console.log(`Setting was changed from ${oldVal} to ${newVal}`);
    },
}
```

### Combo

This lets the user pick from a drop-down list of values.

You can provide options either as a plain string or as an object with `text`
and `value` fields. If you only provide a plain string, then it will be used
for both.

You can let the user enter freeform text by supplying the `editable: true`
attribute, or search by supplying the `filter: true` attribute.

Based on the [Select PrimeVue component](https://primevue.org/select/). Groups
are not supported.

```javascript  theme={null}
{
    id: "example.combo",
    name: "Example combo setting",
    type: "combo",
    defaultValue: "first",
    options: [
        { text: "My first option", value: "first" },
        "My second option",
    ],
    attrs: {
        editable: true,
        filter: true,
    },
    onChange: (newVal, oldVal) => {
        console.log(`Setting was changed from ${oldVal} to ${newVal}`);
    },
}
```

### Color

This lets the user select a color from a color picker or type in a hex
reference.

Note that the format requires six full hex digits - three digit shorthand does
not work.

Based on the [ColorPicker PrimeVue
component](https://primevue.org/colorpicker/).

```javascript  theme={null}
{
    id: "example.color",
    name: "Example color setting",
    type: "color",
    defaultValue: "ff0000",
    onChange: (newVal, oldVal) => {
        console.log(`Setting was changed from ${oldVal} to ${newVal}`);
    },
}
```

### Image

This lets the user upload an image.

The setting will be saved as a [data
URL](https://developer.mozilla.org/en-US/docs/Web/URI/Schemes/data).

Based on the [FileUpload PrimeVue
component](https://primevue.org/fileupload/).

```javascript  theme={null}
{
    id: "example.image",
    name: "Example image setting",
    type: "image",
    onChange: (newVal, oldVal) => {
        console.log(`Setting was changed from ${oldVal} to ${newVal}`);
    },
}
```

### Hidden

Hidden settings aren't displayed in the settings panel, but you can read and
write to them from your code.

```javascript  theme={null}
{
    id: "example.hidden",
    name: "Example hidden setting",
    type: "hidden",
}
```

## Other

### Categories

You can specify the categorisation of your setting separately to the `id`.
This means you can change the categorisation and naming without changing the
`id` and losing the values that have already been set by users.

```javascript  theme={null}
{
    id: "example.boolean",
    name: "Example boolean setting",
    type: "boolean",
    defaultValue: false,
    category: ["Category name", "Section heading", "Setting label"],
}
```

### Tooltips

You can add extra contextual help with the `tooltip` field. This adds a small ℹ︎
icon after the field name that will show the help text when the user hovers
over it.

```javascript  theme={null}
{
    id: "example.boolean",
    name: "Example boolean setting",
    type: "boolean",
    defaultValue: false,
    tooltip: "This is some helpful information",
}
```