# generaltranslation: General Translation Core SDK: formatListToParts
URL: https://generaltranslation.com/en-US/docs/core/functions/formatting/format-list-to-parts.mdx
---
title: formatListToParts
description: Standalone function to format lists into parts while preserving original types
---

## Overview

The standalone `formatListToParts` function formats an array into locale-specific parts without requiring a GT instance.
It inserts string separators between items while preserving the original types of each element, returning an `Array<T | string>`.

```typescript
import { formatListToParts } from 'generaltranslation';

const parts = formatListToParts(['red', 'green', 'blue'], {
  locales: ['es'],
  type: 'disjunction'
});
// Returns: ['red', ', ', 'green', ' o ', 'blue']
```

## Reference

### Parameters

| Name | Type | Description |
|------|------|-------------|
| `array` | `Array<T>` | The array of items to format |
| `options` | `ListFormatPartsOptions & { locales: string \| string[] }` | Formatting configuration with required locales |

### ListFormatPartsOptions

| Name | Type | Description |
|------|------|-------------|
| `locales` | `string \| string[]` | **Required** - Locales for formatting |
| `type?` | `'conjunction' \| 'disjunction' \| 'unit'` | List formatting type (default: `'conjunction'`) |
| `style?` | `'long' \| 'short' \| 'narrow'` | List formatting style (default: `'long'`) |

### Returns

`Array<T | string>` - An array of the original items interleaved with locale-specific string separators.

---

## Example

### Basic usage

```typescript copy
import { formatListToParts } from 'generaltranslation';

// Conjunction list
console.log(formatListToParts(['A', 'B', 'C'], { locales: 'en' }));
// Output: ['A', ', ', 'B', ', and ', 'C']

// Disjunction list
console.log(formatListToParts(['A', 'B', 'C'], { locales: 'en', type: 'disjunction' }));
// Output: ['A', ', ', 'B', ', or ', 'C']
```

### Mixed-type arrays

```typescript copy
// Numbers and objects are preserved
console.log(formatListToParts(['apple', 42, { type: 'fruit' }], { locales: 'en' }));
// Output: ['apple', ', ', 42, ', and ', { type: 'fruit' }]
```

### Locale-specific formatting

```typescript copy
// Spanish disjunction
console.log(formatListToParts(['red', 'green', 'blue'], {
  locales: 'es',
  type: 'disjunction'
}));
// Output: ['red', ', ', 'green', ' o ', 'blue']

// Short style
console.log(formatListToParts(['first', 'second'], {
  locales: 'en',
  style: 'short'
}));
// Output: ['first', ' & ', 'second']
```
---

## Notes

* Unlike the GT class method, the `locales` parameter is required
* Original item types are preserved — only string separators are inserted between elements
* This is the key differentiator from `formatList`, which returns a flat `string`
* Particularly useful for rendering mixed-type arrays in UI frameworks like React
* Uses the same underlying `Intl.ListFormat` as the GT class method

## Next steps

* Check out [`Intl.ListFormat` documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/ListFormat) for more options
* See [`formatNum`](/docs/core/functions/formatting/format-num) for standalone number formatting
* See [`formatDateTime`](/docs/core/functions/formatting/format-date-time) for standalone date formatting
* See GT class [`formatListToParts`](/docs/core/class/methods/formatting/format-list-to-parts) for instance-based usage