Assign Value To Variable After Extracting From Json File Using Powershell

Question

I have the below json file

{
    "name": "ca",
    "version": "5.2.0"
}

I am extracting the value of version and trying to assign it to a variable ver

$jsonString = Get-Content -Path ./package.json
$jsonObj = $jsonString | ConvertFrom-Json

echo $jsonObj.version

Write-Host "##vso[task.setvariable variable=ver]$jsonObj.version"

echo $ver

Below is the output

5.2.0

I am expecting the value to be printed twice and also get it assigned to the variable ver but it is not getting assigned

Nope, in PowerShell, you've assigned it once and printing it once. You haven't provided detail as to what you're trying to do, i.e. what is the vso stuff? — codaamok
– codaamok, Commented Apr 22, 2022 at 6:24
@codaamok I am trying to assign it to a variable so that I can use it in the output of the azure devops pipeline. So, I got vso from Microsoft Documents of Azure Devops Pipeline — user3198755
– user3198755, Commented Apr 22, 2022 at 8:28
Yeah, sounds like that's not the same as a PowerShell variable. Perhaps a variable in the ADO engine/runner instead? — codaamok
– codaamok, Commented Apr 22, 2022 at 8:30

Shamrai Aleksander · Accepted Answer · 2022-04-22 10:03:00Z

1

If you are trying to use it in builds, you will not see a new value in the same step. Additionally, use $($jsonObj.version) in the logging command:

steps:
- powershell: |
   
   $jsonString = Get-Content -Path ./package.json
   $jsonObj = $jsonString | ConvertFrom-Json
   
   $jsonObj.version
   
   Write-Host "##vso[task.setvariable variable=my.ver]$($jsonObj.version)"

  displayName: 'Set vars'

- powershell: |
   $ver = '$(my.ver)'
   
   $ver
   
  displayName: 'Read vars'

answered Apr 22, 2022 at 10:03

Shamrai Aleksander

16.6k4 gold badges27 silver badges38 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

itiic Over a year ago

Is it possible to set Write-Host "##vso[task.setvariable variable=VAR]$($jsonObj)" and in second task get nested value '$(VAR.version)' ?

Shamrai Aleksander Over a year ago

@itiic I do not think so. However, you can try to convert your object to json-string without new lines (like, ConvertTo-Json -Compress). Then in the next steps convert it to an object.

itiic Over a year ago

Yes, minified JSON is being passed. Example:

task1: 		$minifyJSON  = Get-Content 'variables.json' | ConvertFrom-Json | ConvertTo-Json -Compress         Write-Host "##vso[task.setvariable variable=VARS;]$minifyJSON" 		 task2: 		$V =  '$(VARS)' | ConvertFrom-Json 		Write-Host "$($V.key.key_nested)"

Collectives™ on Stack Overflow

Assign Value To Variable After Extracting From Json File Using Powershell

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related