Toolpaper

Convert cURL to ASP.NET

Paste any curl command and get C# code you can drop into a ASP.NET project. IHttpClientFactory-registered HttpClient usage. Runs entirely client-side.

Quick answer

To convert a cURL command to C#, paste it into the Toolpaper workbench below. It parses the command in your browser and emits idiomatic C# code — headers, query string, request body, authentication (Bearer, Basic, API key), and cookies are all wired up automatically. No data is uploaded; conversion is fully client-side.

InputcURL command
MethodPOST·Headers1·Body40 B· Chars 132
Output.NET · HttpClient(.NET)
using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

class Program {
  static async Task Main() {
    using var handler = new HttpClientHandler { AllowAutoRedirect = false };
    using var client = new HttpClient(handler);
    using var request = new HttpRequestMessage(new HttpMethod("POST"), "https://api.example.com/users");
    request.Content = new StringContent("{\"name\":\"Ada\",\"email\":\"ada@example.com\"}", Encoding.UTF8, "application/json");
    using var response = await client.SendAsync(request);
    var text = await response.Content.ReadAsStringAsync();
    Console.WriteLine(text);
  }
}
Inspect

Example

A representative curl command for this scenario. Paste your own above to convert an exact match.

curl input
curl -X POST https://api.example.com/users \
  -H "Content-Type: application/json" \
  -d '{"name":"Ada","email":"ada@example.com"}'

Implementation notes

  • Generated code uses the HttpClient primitive that fits ASP.NET's idioms — you can drop it into a controller, action, or service.
  • Errors and timeouts propagate naturally so you can wrap the call in ASP.NET's middleware and observability layer.
  • Environment variables replace inline secrets when you run the output through the Clean panel first.

Common mistakes

  • Blocking a request-scoped ASP.NET handler on a slow upstream — always set a timeout in the generated call.
  • Recreating an HTTP client per request instead of reusing a module-level one — kills keep-alive performance.
  • Leaking request-scoped headers (auth, tracing) to upstream calls — the generator only forwards what you paste.

Common questions

Which C# library does the ASP.NET output use?
HttpClient, because it's the idiomatic choice inside ASP.NET. Switch libraries in the language dropdown any time.
Can I use this in a serverless function?
Yes. The generated code is a plain C# function; deploy it on ASP.NET's serverless target of choice.
Is any data sent to Toolpaper's servers?
No. Parsing and code generation run entirely in your browser.

Full C# reference on the cURL to C# hub, or open the main converter for all 18 targets.