How can I install Visual Studio Code extensions offline?

Question

I have installed Visual Studio Code on a machine that is not, and cannot be, connected to the Internet. According to the documentation, I can install an extension from the c

Answer 1

A small powershell to get needed information for also visual studio extension :

function Get-VSMarketPlaceExtension {
    [CmdLetBinding()]
    Param(
        [Parameter(ValueFromPipeline = $true,Mandatory = $true)]
        [string[]]
        $extensionName
    )
    begin {
        $body=@{
            filters = ,@{
            criteria =,@{
                    filterType=7
                    value = $null
                }
            }
            flags = 1712
        }    
    }
    process {
        foreach($Extension in $extensionName) {
            $response =  try {
                $body.filters[0].criteria[0].value = $Extension
                $Query =  $body|ConvertTo-JSON -Depth 4
                (Invoke-WebRequest -Uri "https://marketplace.visualstudio.com/_apis/public/gallery/extensionquery?api-version=6.0-preview" -ErrorAction Stop -Body $Query -Method Post -ContentType "application/json")
            } catch [System.Net.WebException] { 
                Write-Verbose "An exception was caught: $($_.Exception.Message)"
                $_.Exception.Response 
            }
            $statusCodeInt = [int]$response.StatusCode

            if ($statusCodeInt -ge 400) {
                Write-Warning "Erreur sur l'appel d'API :  $($response.StatusDescription)"
                return
            }
            $ObjResults = ($response.Content | ConvertFrom-Json).results
    
            If ($ObjResults.resultMetadata.metadataItems.count -ne 1) {
                Write-Warning "l'extension '$Extension' n'a pas été trouvée."
                return
            }
    
            $Extension = $ObjResults.extensions
    
            $obj2Download = ($Extension.versions[0].properties | Where-Object key -eq 'Microsoft.VisualStudio.Services.Payload.FileName').value
            [PSCustomObject]@{
                displayName = $Extension.displayName
                extensionId = $Extension.extensionId
                deploymentType = ($obj2Download -split '\.')[-1]
                version = [version]$Extension.versions[0].version
                LastUpdate = [datetime]$Extension.versions[0].lastUpdated
                IsValidated = ($Extension.versions[0].flags -eq "validated")
                extensionName = $Extension.extensionName 
                publisher     = $Extension.publisher.publisherName
                SourceURL = $Extension.versions[0].assetUri +"/" + $obj2Download
                FileName = $obj2Download                     
            }             
        }
    }
}

This use marketplace API to get extension information. Exemple of usage and results :

>Get-VSMarketPlaceExtension "ProBITools.MicrosoftReportProjectsforVisualStudio"


displayName    : Microsoft Reporting Services Projects
extensionId    : 85e42f76-6afa-4a68-afb5-033d1fe08d7b
deploymentType : vsix
version        : 2.6.7
LastUpdate     : 13/05/2020 22:23:45
IsValidated    : True
extensionName  : MicrosoftReportProjectsforVisualStudio
publisher      : ProBITools
SourceURL      : https://probitools.gallery.vsassets.io/_apis/public/gallery/publisher/ProBITools/extension/MicrosoftReportProjectsforVisualStudio/2.6.7/assetbyname/Microsoft.DataTools.ReportingServices.vsix
FileName       : Microsoft.DataTools.ReportingServices.vsix

All flags value are available here

Thanks to m4js7er and Adam Haynes for inspiration