Invoke-RESTMethod PowerShell - powershell

Question

I am trying to use the Invoke-Restmethod to call a set of API's, but it fails with the below error, i have also posted the same json format, can some let me know what could be wrong ?
### Ignore TLS/SSL errors
add-type #"
using System.Net;
using System.Security.Cryptography.X509Certificates;
public class TrustAllCertsPolicy : ICertificatePolicy {
public bool CheckValidationResult(
ServicePoint srvPoint, X509Certificate certificate,
WebRequest request, int certificateProblem) {
return true;
}}
"#
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
#Create URL string for Invoke-RestMethod
$urlsend = 'https://' + 'vrslcm-01a.corp.local/lcm/api/v1/' + '/login'
#Credential
$Username = "admin#localhost"
$password = "VMware1!"
$basicAuth = "Basic " + [System.Convert]::ToBase64String([System.Text.Encoding]::ASCII.GetBytes("$($Username):$Password"))
$headers = #{
"description"= "Testing Authentication"
}
$body = #{
$raw= '{\n\t\"username\": \"admin#localhost\",\n\t\"password\": \"vmware\"\n}'
"mode"= $raw
}
Invoke-RestMethod -Method POST -uri $urlsend -Headers $headers -Body $body -ContentType 'application/json'
Here is the sample jSON which iam trying to invoke via powershell, it consists of the header and the body. I need to understand how we could call the same jSON POSTMAN example via the PowerShell Invoke-RestMethod
"item": [
{
"name": "authorization",
"description": "",
"item": [
{
"name": "Login",
"event": [
{
"listen": "test",
"script": {
"type": "text/javascript",
"exec": [
"var response=JSON.parse(responseBody)",
"postman.setEnvironmentVariable(\"token\", response.token)"
]
}
}
],
"request": {
"url": "{{Server}}/lcm/api/v1/login",
"method": "POST",
"header": [
{
"key": "Content-Type",
"value": "application/json",
"description": ""
}
],
"body": {
"mode": "raw",
"raw": "{\n\t\"username\": \"admin#localhost\",\n\t\"password\": \"vmware\"\n}"
},
"description": ""
},
"response": []
},
{
"name": "Logout",
"request": {
"url": "{{Server}}/lcm/api/v1/logout",
"method": "POST",
"header": [
{
"key": "x-xenon-auth-token",
"value": "{{token}}",
"description": ""
}
],
"body": {},
"description": ""
},
"response": []
}
]
},

Answer 1

make $raw to a hashtable like
$raw = #{
username=$Username
password=$Password
}
add this hashtable to the $body hashtable
$body = #{
mode= $raw
}
but now it still is a hashtable the api cannot use. thus convert it to json like
$jsonBody = $body | ConvertTo-Json
using $jsonBody should then work when used like
Invoke-RestMethod -Method POST -uri $urlsend -Headers $headers -Body $jsonBody -ContentType 'application/json'

Answer 2

Like the error states, the problem is your hash definition.
A null key is not allowed in a hash literal.
PowerShell tries to evaluate $raw as a hash table key. Since it hasn't been defined before it is null and fails because null is not allowed. Try it like this:
$raw= '{\n\t\"username\": \"admin#localhost\",\n\t\"password\": \"vmware\"\n}'
$body = #{
"mode"= $raw
}