How to convert curl to PowerShell Invoke-RestMethod code

To convert a curl command to native PowerShell, call Curl.ToPowershellCode(cmd) from C#, or [CurlDotNet.Curl]::ToPowershellCode('curl ...') from PowerShell. It returns an Invoke-RestMethod line you can paste into a script that has no CurlDotNet dependency.

From C#

using CurlDotNet;

var cmd = "curl -X POST https://api.example.com/users " +
          "-H 'Authorization: Bearer abc' -H 'Content-Type: application/json' " +
          "-d '{\"name\":\"Ada\"}'";

Console.WriteLine(Curl.ToPowershellCode(cmd));

Output (one line, wrapped here):

Invoke-RestMethod -Uri "https://api.example.com/users" -Method POST `
  -Headers @{"Authorization"="Bearer abc"; "Content-Type"="application/json"} `
  -Body "{`"name`":`"Ada`"}" -ContentType "application/json"

The JSON quotes are escaped with backticks, which is correct inside a double-quoted PowerShell string.

From the fluent builder

If you build requests in C# with CurlRequestBuilder, ToCurlCommand() gives you the curl string to convert:

using CurlDotNet;
using CurlDotNet.Core;

var curl = CurlRequestBuilder.Post("https://api.example.com/users")
    .WithBearerToken("abc").WithJson(new { name = "Ada" }).ToCurlCommand();

Console.WriteLine(Curl.ToPowershellCode(curl));

From PowerShell

$code = [CurlDotNet.Curl]::ToPowershellCode(@'
curl -X DELETE https://api.example.com/users/1 -H "Authorization: Bearer t"
'@)
$code
# Invoke-RestMethod -Uri "https://api.example.com/users/1" -Method DELETE -Headers @{"Authorization"="Bearer t"}

Review generated code before you run it. Do not pipe it straight into Invoke-Expression, especially when the curl command came from somewhere you do not control.

What gets translated

In 9.8.0 the PowerShell generator carries over the URL, method, headers and body. --json becomes the body plus Content-Type and Accept headers. Other flags are dropped without a warning (unlike ToHttpClient and ToPythonRequests, which also translate -u, -x, -k, -L, -m and -F). Add them by hand:

curl flag Add to Invoke-RestMethod
-u user:pass -Authentication Basic -Credential (Get-Credential) (PowerShell 7) or an Authorization header
-k -SkipCertificateCheck (PowerShell 6+)
-L Nothing; redirects are followed by default (-MaximumRedirection 0 turns them off)
-m 10 -TimeoutSec 10
-o file -OutFile file
-F 'f=@a.pdf' -Form @{ f = Get-Item a.pdf } (PowerShell 6.1+)
-x http://proxy:8080 -Proxy http://proxy:8080 (-ProxyCredential for auth)
-A 'MyApp/1.0' -UserAgent 'MyApp/1.0'
-I Already -Method HEAD; use Invoke-WebRequest to see the headers

Content-Type appears twice

When the curl command sets Content-Type with -H, the output has it both in -Headers and in -ContentType. If your PowerShell version complains about the duplicate, delete it from the -Headers hashtable; -ContentType is enough.

Generate other languages from the same command

using CurlDotNet;

var cmd = "curl -H 'Accept: application/json' https://api.example.com/items";
Console.WriteLine(Curl.ToHttpClient(cmd));      // C# HttpClient
Console.WriteLine(Curl.ToPythonRequests(cmd));  // Python requests
Console.WriteLine(Curl.ToFetch(cmd));           // JavaScript fetch

Or skip conversion and run the curl command itself with [CurlDotNet.Curl]::Execute; see running curl commands from PowerShell.