How to add json object to arguments

I'm trying to add json object to my powershell script using cmd. My issue, is that I receive the string but without any quotes.

My script.ps1:

Write-Host ($args[0] | Format-Table | Out-String)

My command line :

C:\path\to\powershell.exe ./script.ps1 '{"key1":"val1","all":[{"key2":"val2","key3":"val3","key4":["val5","val6"]},{"key5":"val7","key6":"val8","key7":["val9","val10"]}],"key8":0}'

Result :

{key1:val1,all:[{key2:val2,key3:val3,key4:[val5,val6]},{key5:val7,key6:val8,key7:[val9,val10]}],key8:0}

How can I get my json with quotes ?

Solution

When using PowerShell's CLI, unescaped " on the command line are removed during command-line parsing, and only then is the result interpreted as PowerShell code to execute (due to the (implied) use of the -Command / -c parameter).^[1]

You have two options:

As Compo notes and demonstrates in his comment, escaping all " chars. as \" would work - the escaping ensures that they are retained, in unescaped form, and therefore become part of the PowerShell code to execute.
If you want to avoid escaping, provide the text via the pipeline (stdin):

echo {"key1":"val1","all":[{"key2":"val2","key3":"val3","key4":["val5","val6"]},{"key5":"val7","key6":"val8","key7":["val9","val10"]}],"key8":0}| powershell.exe -c ./script.ps1 $input

Note the absence of a space before |, as such spaces would otherwise become part of the input.

In the PowerShell command, the piped-in text is accessed via the automatic $input variable

^{[1] It is for this reason that the outer '...' quoting does not protect the unescaped " inside it: During the initial parsing of the command line, ' characters have no syntactic meaning.}