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cURL Converter

Paste any curl command and get equivalent code in fetch, Python requests, or Node — headers, method, and body parsed automatically. Great for turning API docs into working code.

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Generated code

fetch('https://api.example.com/users', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  body: "{\"name\":\"Ada\"}"
})
  .then((res) => res.json())
  .then(console.log);

How to use cURL Converter

The cURL Converter transforms a curl command into equivalent code in JavaScript fetch, Python requests, Node.js, PHP, and other languages — parsing the method, URL, headers, body, auth flags, and other options automatically. It removes the friction of translating API documentation examples (which are almost always written as curl) into the language your application actually uses, entirely in your browser without any server upload.

  1. Paste a complete curl command into the input field, including all flags such as -H, -d, -X, --data-raw, and -u.
  2. Select the target language or library from the output selector: JavaScript fetch, Python requests, Node.js (axios or node-fetch), PHP cURL, or Go net/http.
  3. Review the generated code — the tool maps each curl flag to the correct parameter in the target library.
  4. Copy the code and paste it directly into your project or a test file.
  5. For commands with Basic Auth (-u user:pass), the converter encodes credentials correctly for each language's auth mechanism.

Your data never leaves your device — 100% private processing.

Anatomy of a curl command

A curl command follows the pattern: curl [options] <url>. The most important flags are: -X (HTTP method, default GET), -H "Header: Value" (request header, repeatable), -d or --data (request body for POST/PUT), --data-raw (body without URL-encoding), -u user:pass (Basic Auth), -b (send cookies), -k or --insecure (skip TLS verification, never use in production), -L (follow redirects), and -o (write output to file). The converter parses these flags and maps them to idiomatic equivalents in each target language.

curl flag to library mapping
curl flagJavaScript fetchPython requests
-X POSTmethod: "POST"method="POST" or requests.post()
-H "Key: Val"headers: { Key: "Val" }headers={"Key": "Val"}
-d "body"body: "body"data="body"
--json "..."body: JSON.stringify(...)json={...}
-u user:passAuthorization: Basic btoa(...)auth=("user", "pass")
-kN/A (browser always validates)verify=False

When to use each language target

Python requests is the most readable option for scripting and automation, with excellent support for sessions, retries, and multipart uploads. JavaScript fetch is the right choice for front-end code or Deno/Node 18+ servers. Axios (Node.js) adds automatic JSON parsing, request/response interceptors, and timeout support that the native fetch API lacks in older environments. Go's net/http is verbose but explicit, preferred for microservices where minimising dependencies matters. PHP cURL is required for legacy WordPress plugins or any PHP 5.x/7.x environment that predates Guzzle.

Worked examples

curl POST to fetch

Inputs: curl -X POST -d '{}' https://api.x/v1

Result: fetch(url, { method: "POST", body: "{}" })

Header flag mapped

Inputs: curl -H "Authorization: Bearer x"

Result: headers: { Authorization: "Bearer x" }

Basic auth

Inputs: curl -u user:pass

Result: Authorization: Basic <base64> / auth=("user","pass")

Glossary

curl
A command-line tool and library for transferring data with URLs, supporting HTTP, HTTPS, FTP, and dozens of other protocols.
fetch API
A browser and Node.js built-in function for making HTTP requests that returns Promises, replacing XMLHttpRequest.
Basic Auth
An HTTP authentication scheme that encodes username:password as Base64 in the Authorization header.
--data-raw
A curl flag that sends the body string exactly as given, without interpreting @ file references or stripping newlines.
TLS verification
The process of validating the server's SSL/TLS certificate chain; skipping it with -k is insecure in production.

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