# ReferenceExpressionBuilder.appendFormatted

- Module: [Aspire.Hosting](/reference/api/typescript/aspire.hosting.md)
- Defined on: [ReferenceExpressionBuilder](/reference/api/typescript/aspire.hosting/referenceexpressionbuilder.md)
- Version: `13.4.0`
- Kind: `method`

Appends a formatted value to the expression.

## Definition

```typescript
interface ReferenceExpressionBuilder {
  // ... omitted for brevity
  appendFormatted(
      value: string,
      format?: string): void;
}
```

## Signature

```typescript
appendFormatted(
    value: string,
    format?: string): void
```

## Parameters

- `value` (`string`)
- `format` (`string`) `optional`

## Defined on

- [ReferenceExpressionBuilder](/reference/api/typescript/aspire.hosting/referenceexpressionbuilder.md) -- `handle`