SimpleJSON Library Usage Example

Explains the steps for reading a JSON file, converting it to a Dictionary with the Deserialize function and getting values from keys.

Overview

Turning the trigger flag ON reads the JSON file and converts it to a Dictionary
Turning the ReadTrigger flag ON reads the value of the Key

Circuit

Variables

Variable list for the SimpleJSON usage example

Ladder logic

SimpleJSON ladder program

File (test.json)

{ "image": { "width": 800, "height": 600, "Title": "View from 15th Floor", "Thumbnail": { "Url": "http://www.example.com", "Height": 125, "Width": "100" }, "IDs": [116,943, 234, 38793] }, "image2": { "width": 100, "height": 200, "Title": "View from 16th Floor", "Thumbnail": { "Url": "http://www.example.com", "Height": 25, "Width": "10" }, "IDs": [16,93, 24, 3793] } }

Result

Turn Trigger ON to read the file
The read file is stored in a dictionary with the Deserialize instruction
Turning ReadTrigger ON reads the value of the image.width key
The value "800" of the image.width key is obtained

FAQ

Can nested JSON be handled?

Yes. It is saved as dot-separated keys such as image.Thumbnail.Url.

Can arrays be handled?

JSON arrays can also be retrieved. In the example, the IDs array is saved.

Can Japanese key names be used?

UTF-8 is supported, so keys containing kanji can be handled.