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In order to work with json you will need:
1. Text editor
2. Nodejs Compiler
As a text editor you can use notepad.exe
And you can download nodejs from this site: https://nodejs.org/en
After writing your program in order to run it you write:
node filename.js
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$url = "https://gist.githubusercontent.com/sanderstad/1c47c1add7476945857bff4d8dc2be59/raw/d12f30e4aaf9d2ee18e4539b394a12e63dea0c9c/SampleJSON1.json"
$json = (New-Object System.Net.WebClient).DownloadString($url)
$data = $json | ConvertFrom-Json
$data.colors