---
title: File name patterns
url: https://documentation.cluedin.net/publish/export-targets/file-name-patterns
content_type: reference
section: Publish & consume > Export targets
---

# File name patterns

> reference: Facts, options, APIs.

In this article, you will learn about the file name patterns that you can use in the export target configuration to customize the output file names.

## Supported file name patterns

CluedIn supports the following file name patterns:

- `{DataTime}` and `{DataTime:formatString}`. `DataTime` is in UTC, and `formatString` accepts formats available to the `DateTime.ToString()` method in C#. For more information, see Microsoft documentation: [Standard date and time format strings](https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-date-and-time-format-strings) and [Custom date and time format strings](https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings).

    When using `{DataTime}` without `formatString`, it defaults to the `o` format (for example, `2024-07-05T03:02:57.2612933Z`).

- `{StreamId}` and `{DataTime:formatString}`. `formatString` accepts formats available to the `Guid.ToString()` method in C#. For more information, see [Guid.ToString Method](https://learn.microsoft.com/en-us/dotnet/api/system.guid.tostring?view=net-8.0).

    When using `{StreamId}` without `formatString`, it defaults to `D` format (for example, `ba4afc12-f6dc-4394-b9d5-68f6dacf3b3b`).

- `{OutputFormat}` and `{OutputFormat:formatString}`. `formatString` accepts the following methods:

    - `ToUpperInvariant`
    - `ToUpper` (equivalent to `ToUpperInvariant`)
    - `ToLower`
    - `ToUpperInvariant` (equivalent to `ToLowerInvariant`)

    When using `{OutputFormat}` without `formatString`, no extra formatting is performed (for example, `csv`, `parquet`, `json`).

- `{ContainerName}` and `{ContainerName:formatString}`. `{ContainerName}` uses the value in the **Target Name** of the [stream](https://documentation.cluedin.net/publish/streams/create-a-stream.md#configure-an-export-target). `formatString` accepts the following methods:

    - `ToUpperInvariant`
    - `ToUpper` (equivalent to `ToUpperInvariant`)
    - `ToLower`
    - `ToLowerInvariant` (equivalent to `ToLowerInvariant`)

## Example filename patterns

| File name pattern  | Example output  |
|--|--|
| `{StreamId:N}_{DataTime:yyyyMMddHHmmss}.{OutputFormat}` | `ba4afc12f6dc4394b9d568f6dacf3b3b_20240705030355.parquet` |
| `{StreamId}_{DataTime}.{OutputFormat:ToUpper}` | `ba4afc12-f6dc-4394-b9d5-68f6dacf3b3b_2024-07-05T03:02:57.2612933Z.PARQUET` |
| `{ContainerName}_{DataTime:yyyyMMddHHmmss}.{OutputFormat}` | `CustomerRecord_20240705030355.parquet` |

## Default file name patterns

| Connector | Default file name pattern |
|--|--|
| [Azure Data Lake connector](https://documentation.cluedin.net/publish/export-targets/adl-connector.md) | `{StreamId:D}_{DataTime:yyyyMMddHHmmss}.{OutputFormat}` |
| [OneLake connector](https://documentation.cluedin.net/publish/export-targets/onelake-connector.md) | `{StreamId:N}_{DataTime:yyyyMMddHHmmss}.{OutputFormat}` |

Up: [Export targets](https://documentation.cluedin.net/publish/export-targets.md)