Read data (key Read data (key, value) from properties files


The Property Input transform reads key/values pairs from a Java properties files.

More information on this file format is available on Wikipedia

Supported Engines

Hop Engine



Maybe Supported


Maybe Supported


Maybe Supported


Files Tab

Option Description

Transform name

Name of the transform this name has to be unique in a single pipeline.

Filenames from field

  • Filename is defined in a field? : the previous transform is giving filenames in a certain field in the input stream. These are read.

  • Get filename from field : specify the field to the filenames from.

File or directory

Specifies the location and/or name of the input text file. Important: Click Add to add the file/directory/wildcard combination to the list of selected files (grid) below.

Regular expression

Specifies the regular expression you want to use to select the files in the directory specified in the previous option.

Selected Files

Contains a list of selected files (or wildcard selections) and a property specifying if file is required or not. If a file is required and it is not found, an error is generated;otherwise, the file name is skipped.

Show filenames(s)…​

Displays a list of all files that will be loaded based on the current selected file definitions

Content Tab

Option Description

Include filename in output?

Allows you to specify a field name to include the file name (String) in the output of this transform.

Rownum in output

Allows you to specify a field name to include the row number (Integer) in the output of this transform.

Reset rownum per file?

Enable this option if you want the generated row number (optional) to be reset (to 1) at the start of every individual file.


Limits the number of rows to this number (zero (0) means all rows).

Result filenames

  • Add files to result filename : Adds the names of the files read to the result of this pipeline. A unique list is being kept in memory that can be used in the next workflow action in a workflow, for example in another pipeline.


Option Description


The name of the output field


The attribute to read


The data type to convert to


The format or conversion mask to use in the data type conversion


The length of the output data type


The precision of the output data type


The currency symbol to use during data type conversion


The numeric decimal symbol to use during data type conversion


The numeric grouping symbol to use during data type conversion

Trim type

The type of trimming to use during data type conversion


Repeat the column value of the previous row if the column value is empty (null)