Read JSON

Read JSON Objects ..

Workshop - Read JSON

Steel Wheels have several JSON data sources. You will create a simple workflow to extract the required reporting dataset.

In this workshop, you will configure the following step:

• JSON Input

JSON Input

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Create a new Transformation

Any one of these actions opens a new Transformation tab for you to begin designing your transformation.

• By clicking File > New > Transformation

• By using the CTRL-N hot key

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Second Tab

1. View the jsonfile.js

{ "document": {
    "order": [ 
      { "productline": "Classic Cars",
        "customer": "Christine Loomis",
        "status": "Delivered",
	"date": "January 2004",
        "value": 21.99
      },
      { "productline": "Classic Cars",
        "customer": "Mary L. Peachin",
        "status": "Delivered",
	"date": "November 2008",
        "value": 24.99
      },
      { "productline": "Trains",
        "customer": "Bob Italia",
        "status": "Delivered",
        "date": "July 1994",
        "value": 14.99
      },
```

Notice that the delivery status can be Delivered | Returned

1. JSON Input

JSON Input

The JSON Input step extracts relevant portions out of JSON structures, files or incoming fields, and outputs rows.

1. Start Pentaho Data Integration.

Windows - Powershell

Set-Location C:\Pentaho\design-tools\data-integration
.\spoon.bat

Linux

cd
cd ~/Pentaho/design-tools/data-integration
./spoon.sh

1. Drag the ‘JSON Input’ step onto the canvas.

2. Double-click on the step, and configure the following properties:

JSON input - File

Using the internal variable to point to configure file path.

1. Click on the ‘Fields’ tab and configure the following properties:

JSON - fields

1. Close the Step.

➡️ Next: Dummy

Json Parser Online

Link to Online JSON parser

2. Dummy

Dummy

The Dummy step does process records. Its primary function is to be a placeholder for testing purposes. For example, to have a transformation, you need at least two steps connected to each other.

1. To add the Dummy step, expand the ‘Flow’ category in the Design tab, and drag the Dummy step onto the canvas.

2. Draw a Hop from the JSON Input to Dummy step.

➡️ Next: Finally RUN the Transformation

3. RUN

RUN the Transformation

Finally .. execute the transformation locally.

1. Click the Run button in the Canvas Toolbar.

2. Preview the data.

Preview data