cURL to JavaScript Converter

What is cURL to JavaScript?

cURL to JavaScript parses a curl command's method, URL, headers and body, and generates equivalent JavaScript using the native fetch() API — useful when porting a curl example from API documentation into browser or Node.js code.

How to use cURL to JavaScript

1. Paste a curl command into the Input box.
2. Click Convert.
3. Copy the generated fetch() code.

Features

• Supports method, headers, body and HTTP Basic auth.
• Generates fetch() code with a .then() promise chain.
• Never runs the request itself.
• 100% client-side — your command never leaves your browser.

Example

This curl command:

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

becomes:

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

Tips for JavaScript developers

• fetch() does not reject on a 4xx or 5xx response — only on a network failure. Check response.ok or response.status yourself if you need to handle HTTP errors.
• Swap the .then() chain for async/await if you prefer: const response = await fetch(url, options); const data = await response.text(); inside an async function.
• If the response body is JSON, use response.json() instead of response.text().
• fetch() is built into every modern browser and into Node.js 18+ — no extra package needed.

Is cURL to JavaScript Converter safe?

Yes. Parsing your curl command and generating the fetch()-based code with its .then() chain both happen locally in your browser — the command you paste is never uploaded to our servers, and the generated code only runs when you choose to run it yourself.

Frequently Asked Questions

Related tools

• cURL Generator
• cURL to Python
• cURL to Java