---
title: "Icons"
description: "How FlowDrop uses Iconify for icons across nodes, categories, and UI."
source: https://flowdrop.io/docs/editor/reference/icons
site: FlowDrop documentation
---
# Icons
FlowDrop uses [Iconify](https://iconify.design/) for all icons throughout the editor — node icons, category icons, status indicators, and toolbar actions.

## How it works

Icons are rendered via [`@iconify/svelte`](https://iconify.design/docs/icon-components/svelte/), which is listed as an **optional peer dependency**. When installed, the Iconify component fetches icons on demand from the Iconify API, giving you access to **200,000+ icons** from 150+ open-source sets with zero bundling overhead.

Install it alongside FlowDrop:

```bash
npm install @iconify/svelte
```

## Icon format

All icon fields in FlowDrop use the Iconify string format:

```text
set:icon-name
```

For example:

```js
'mdi:brain'; // Material Design Icons
'heroicons:sparkles'; // Heroicons
'lucide:bot'; // Lucide
'ph:brain'; // Phosphor Icons
'tabler:api'; // Tabler Icons
```

You can browse and search all available icon sets at **[icon-sets.iconify.design](https://icon-sets.iconify.design/)**.

## Where icons are used

Icons appear in several places within FlowDrop:

| Context              | Field      | Example              |
| -------------------- | ---------- | -------------------- |
| Node definition      | `icon`     | `'mdi:text'`         |
| Category definition  | `icon`     | `'mdi:import'`       |
| Status indicators    | (internal) | `'mdi:check-circle'` |
| Toolbar & UI actions | (internal) | `'mdi:content-save'` |

### Node icons

Set the `icon` field on a node definition:

```js
const myNode = {
  id: 'text_input',
  name: 'Text Input',
  icon: 'mdi:text' // Any Iconify icon
  // ...
};
```

FlowDrop resolves icons with a fallback chain:

1. The node's own `icon` field
2. The category's icon
3. Default fallback: `mdi:cube`

### Category icons

Set the `icon` field on a category definition:

```js
const myCategory = {
  id: 'inputs',
  name: 'Inputs',
  icon: 'mdi:import',
  color: '#22c55e'
};
```

## Built-in default icons

FlowDrop includes a set of built-in icon constants used across the editor UI. These are not required for your own nodes — they document what the editor uses internally.

### UI action icons

| Key        | Icon               | Usage          |
| ---------- | ------------------ | -------------- |
| `ADD`      | `mdi:plus`         | Add buttons    |
| `REMOVE`   | `mdi:minus`        | Remove buttons |
| `EDIT`     | `mdi:pencil`       | Edit actions   |
| `SAVE`     | `mdi:content-save` | Save workflow  |
| `EXPORT`   | `mdi:download`     | Export actions |
| `IMPORT`   | `mdi:upload`       | Import actions |
| `SEARCH`   | `mdi:magnify`      | Search fields  |
| `CLOSE`    | `mdi:close`        | Close buttons  |
| `SETTINGS` | `mdi:cog`          | Settings panel |

### Status icons

| Status    | Icon                 |
| --------- | -------------------- |
| Idle      | `mdi:circle-outline` |
| Pending   | `mdi:clock-outline`  |
| Running   | `mdi:loading`        |
| Completed | `mdi:check-circle`   |
| Failed    | `mdi:alert-circle`   |
| Cancelled | `mdi:cancel`         |
| Skipped   | `mdi:skip-next`      |

### Built-in category icons

When you define categories, you can use any icon you like. For reference, these are the icons FlowDrop uses for common category IDs:

| Category ID  | Icon                    |
| ------------ | ----------------------- |
| `triggers`   | `mdi:lightning-bolt`    |
| `inputs`     | `mdi:arrow-down-circle` |
| `outputs`    | `mdi:arrow-up-circle`   |
| `prompts`    | `mdi:message-text`      |
| `models`     | `mdi:robot`             |
| `processing` | `mdi:cog`               |
| `logic`      | `mdi:source-branch`     |
| `data`       | `mdi:database`          |
| `tools`      | `mdi:wrench`            |
| `ai`         | `mdi:shimmer`           |
| `agents`     | `mdi:account-cog`       |
| `memories`   | `mdi:brain`             |
| `interrupts` | `mdi:hand-back-left`    |

## Icon validation

FlowDrop validates icon strings against the format `set:icon-name` (lowercase letters and hyphens). Invalid icons fall back to `mdi:cube`.

```js
'mdi:brain'; // ✓ valid
'heroicons:bolt'; // ✓ valid
'Brain'; // ✗ invalid — falls back to mdi:cube
```

## Popular icon sets

Here are some commonly used icon sets that work well with FlowDrop:

| Set                   | Prefix       | Icons  | Browse                                                |
| --------------------- | ------------ | ------ | ----------------------------------------------------- |
| Material Design Icons | `mdi:`       | 7,000+ | [Browse](https://icon-sets.iconify.design/mdi/)       |
| Heroicons             | `heroicons:` | 300+   | [Browse](https://icon-sets.iconify.design/heroicons/) |
| Lucide                | `lucide:`    | 1,500+ | [Browse](https://icon-sets.iconify.design/lucide/)    |
| Phosphor              | `ph:`        | 7,000+ | [Browse](https://icon-sets.iconify.design/ph/)        |
| Tabler Icons          | `tabler:`    | 5,000+ | [Browse](https://icon-sets.iconify.design/tabler/)    |
| Carbon                | `carbon:`    | 2,000+ | [Browse](https://icon-sets.iconify.design/carbon/)    |

The full catalog is at [icon-sets.iconify.design](https://icon-sets.iconify.design/).