---
title: Output Processors
slug: litmusedge-v2/output-processors
docTags: 
createdAt: 2024-08-06T18:51:34.816Z
---

The Analytics module makes use of built-in Output processors to write the results of Statistical Functions and KPIs to a topic or database. 

The following describes the output processors that are currently available.

# Database Output Processors

## Database Output Overview

- Publish all inputs to a specified DB metric.

## Database Output Parameters

| **Parameters** | **Details**                                        |
| -------------- | -------------------------------------------------- |
| Database       |  If left empty, the default database will be used. |
| Measurement    | Name of the measurement to publish.                |
| Typed          | Publish typed name.                                |

:::hint{type="info"}
**Note**: The *Measurement *parameter is a required field. 
:::

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# DataHub Publish Processors

## DataHub Publish Overview

- Publish events from input to a specified DataHub topic.

## DataHub Publish Parameters

| **Parameters** | **Details**                                  |
| -------------- | -------------------------------------------- |
| Single Topic   | Select if there is only one topic to export. |
| Topic          | Topic name for DataHub publish.              |

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# File Write Processors

## File Write Overview

- Converts input data to specified format, and writes it to a file.
  - This can be done by either adding to the end of the file, or replacing the existing content.
  - Alternatively, it can also delete the file.
- If the **"Generate Filename From Expression"** option is enabled, the filename will be evaluated as expression.
  - For example, if you want to get the filename from "path" and name" properties of incoming connection "AAA", your expression could be: **AAA\_path + AAA\_name + ".txt"**
  - Please note that static text in expressions should be put into quotes.
- Timer interval in seconds acts as a **"Re-write file on timer"** option.
  - This is useful if you want to keep generating new file names after every few intervals.
- If ***"Output File Type"*** is set to **value only** processor will save incoming data from **"value""** payload field as is.
- If ***"Output File Type"*** is set to **CSV** following options will affect output:
  - **CSV Comma** contains CSV-file delimiter (only first character will be used from string entered).
  - **CSV Header** controls whether column names will be included or not.
  - **CSV Columns From Payload** controls whether column names will be generated from payload.
  - **CSV Custom Columns** contains comma-separated list of columns names (overrides **CSV Columns From Payload**!)
- If ***"Output File Type"*** is set to **Parquet** output file will be rewritten on each incoming payload.
  - If  **Write file Method  **is set to "append" then last **Parquet Buffer Capacity** records will be written to file.

## File Write Parameters

| **Parameters**                    | **Details**                                                                                 |
| --------------------------------- | ------------------------------------------------------------------------------------------- |
| File Name                         | Specifies the name of the file to which data will be written.                               |
| File Write Method                 | Determines how the data will be written to the file (e.g., appending, overwriting, delete). |
| Output File Type                  | Defines the format of the output file (e.g., JSON, CSV, Parquet).                           |
| Add New Line                      | Indicates whether to append a new line after each entry in the output file.                 |
| Create Directories                | Option to automatically create any necessary directories if they do not exist.              |
| Generate Filename From Expression | Enables dynamic filename generation based on specified expressions.                         |
| Time Interval in Seconds          | Sets a timer for rewriting the file at specified intervals.                                 |
| CSV Comma                         | Specifies the delimiter to be used in CSV files; only the first character will be applied.  |
| CSV Header                        | Controls the inclusion or exclusion of column names in the output CSV file.                 |
| CSV Columns From Payload          | Determines if column names should be generated based on the incoming payload.               |
| CSV Custom Columns                | Allows the specification of custom column names, overriding those from the payload.         |
| Parquet Capacity                  | Defines the buffer size for records in Parquet files, influencing how data is written.      |

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# StdOut Processors

## StdOut Overview

- Just consumers that print to the console.****
  **Note:** The output is meant for support logs, not for display on the UI.

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