⌘ K
curl → c# · HttpClient · async · live

Convert cURL to C#

Translate a cURL command into an idiomatic C# HttpClient snippet — async/await, structured headers, JSON-aware body.

cURL → C# (HttpClient)
Input
161 B
4 lines
Output
531 B
8 lines
Status
ready
live
Ratio
3.30×
out/in
input · curl command
output · c# (httpclient)
using var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Post, "https://api.example.com/users");
request.Headers.TryAddWithoutValidation("Content-Type", "application/json");
request.Headers.TryAddWithoutValidation("Authorization", "Bearer abc123");
request.Content = new StringContent("{\"name\":\"Alice\",\"role\":\"admin\"}", System.Text.Encoding.UTF8, "application/json");
var response = await client.SendAsync(request);
var body = await response.Content.ReadAsStringAsync();
Console.WriteLine(body);
Quick Start

How to port cURL to C# (HttpClient)

C# HttpClient is the standard for HTTP in .NET. The generator builds an HttpRequestMessage, sets headers, and uses SendAsync — ready to drop into any async method.

  1. 01

    Paste cURL

    From DevTools, Postman, an SDK doc — anything that emits a cURL command.

    Parsing is strict-but-tolerant — comments and trailing commas are accepted on input where the source format historically permits them; output stays canonical.

    inputstricttolerantliveparse
    in · sourcecurl · live
    curl -X POST https://api.example.com
    loaded · parsedtarget · ready
  2. 02

    Parser pulls fields

    URL, method, headers, body and basic auth are extracted into a structured shape.

    Conversion preserves type information where the target supports it (numbers stay numeric, booleans stay boolean) so the destination parser never has to re-coerce.

    parsetype-preservinglosslesslivememoised
    url · optionsheaders · live
    { url, method, headers, data }
    options applied · liveround-trip
  3. 03

    Emit C# (HttpClient)

    The generator turns the parsed command into idiomatic code for the target stack.

    Re-encoding is idempotent: running output back through the same converter produces the same bytes, which keeps round-trips git-friendly.

    genidempotentround-tripdiff-cleandeterministic
    out · convertedC# (HttpClient) · ready
    using var client = new HttpClient();
var res = await client.SendAsync(req);
    converted · livediff-clean
  4. 04

    Copy or download

    Drop into your project and tweak as needed.

    Copy writes via navigator.clipboard.writeText; downloads use the target’s native MIME so editors apply the right syntax highlighting on open.

    exportclipboardtarget MIMEblobclient-side
    ✓ · copiedready · done
    ✓ Copied
    shipped · ready to shipsuccess
Pro tips

Converting between formats, safely

Pick the strictest source format

Lossy formats hide bugs. Choose JSON or YAML as your source-of-truth, convert downstream as needed.

Round-trip in CI

If your converter is idempotent, your CI can verify A → B → A equals the original. Catches subtle data loss.

Numbers vs strings differ

YAML/TOML have a number type; CSV doesn’t. Quote IDs in CSV to keep leading-zero values intact.

Watch character encoding

Source format may be Latin-1 / Windows-1252; target should be UTF-8. Convert encoding before structure.

Preserve comments where you can

YAML and TOML support comments. Don’t silently drop them — they often encode intent.

Schema-aware beats blind

Use a schema to guide conversion. Field types, required-ness, and defaults survive better with structure.

Related toolscURL to fetch()cURL to GocURL to PythoncURL to JavacURL to PowerShellcURL to Code
Use Cases

When to port cURL to C# (HttpClient)

Migration, polyglot teams, integration tests.

.NET services

Drop into an ASP.NET controller or worker. Type information survives: numbers stay numeric, booleans stay boolean, strings stay strings. The destination parser doesn't have to re-coerce, which avoids the "'true' becomes "true"" bug class.

round-trip safe

Console apps

Quick C# script from a curl example. Run output back through the inverse converter to verify idempotent round-trips in CI. A → B → A should produce byte-identical input — if it doesn't, you've found data loss.

type-preserving

Integrations

Wire a third-party API into a .NET app. Comments and metadata survive where the target format supports them (YAML, TOML, HCL). The tool doesn't silently drop intent-encoded annotations, which keeps your config self-documenting.

schema-aware

Unit tests

Use as fixture for HttpClient-based tests. Pair with a schema (JSON Schema, OpenAPI, Zod, Pydantic) to catch shape drift on either side. Catch breaking changes at conversion time rather than at runtime in production.

lossless

Migrations

Move legacy WebClient code to HttpClient. Output respects target-format conventions: quoting in CSV, indent in YAML, brackets in JSON. Existing parsers don't need patches, and the result drops into legacy pipelines unchanged.

diff-clean

Polyglot hand-off

Hand a curl to the .NET team in their idiom. Encoding-aware: handles UTF-8 vs UTF-16 vs Latin-1 / Windows-1252 transparently. The character-set surprise that breaks "works on my machine" doesn't apply here.

spec-grade
FAQ

Frequently asked questions

Yes — SendAsync with await. Adapt for sync contexts using .Result if needed.
Body is passed as a StringContent. Use System.Text.Json or Newtonsoft.Json to serialize/deserialize.
Headers are added as-is, including Authorization. Use DefaultRequestHeaders for shared auth.
Snippet creates a new client per call. Prefer HttpClientFactory in production for proper lifecycle management.
No. Parsing and code generation run locally in your browser.
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