Public/ConvertFrom-Jwt.ps1
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function ConvertFrom-Jwt { <# .SYNOPSIS Converts a JSON Web Token (JWT) into a readable object. .DESCRIPTION This function takes a JWT string as input and decodes it into a readable object. It can be used to inspect the contents of a JWT for debugging or informational purposes. .PARAMETER Jwt The JWT string that needs to be decoded. .EXAMPLE PS C:\> ConvertFrom-Jwt -Jwt "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c" This command decodes the provided JWT string and returns its contents as a readable object. .INPUTS [string] The JWT string to be decoded. .OUTPUTS [PSCustomObject] The decoded contents of the JWT. #> [cmdletbinding()] param ( [Parameter(Mandatory)] [string]$Token ) if (!$token.Contains(".") -or !$token.StartsWith("eyJ")) { Write-Error "Invalid token" -ErrorAction Stop } $splitToken = $token.Split(".") $decodedJwt = @() foreach ($part in $splitToken) { $decodedJwt += ConvertFrom-Base64Url -Base64UrlSafeString $part } return [PSCustomObject]@{ Header = $decodedJwt[0] | ConvertFrom-Json Payload = $decodedJwt[1] | ConvertFrom-Json } } |