Codeflips
JavaScript and APIAPI Developer100% Client-Side • Zero Uploads

cURL to Fetch Converter - Free & In-Browser

Convert terminal cURL commands into clean modern JavaScript fetch requests.

cURL Commandtext
3 lines
JavaScript Fetch Codejavascript
100% In-Browser Execution • Zero Server Uploads
🔒

Zero-Upload Privacy Guarantee

This tool runs 100% in your browser, nothing is uploaded to any server. Your proprietary code and credentials never leave your machine.

Local Memory Sandboxed

How to Use the cURL to Fetch Converter

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1. Copy cURL from Browser DevTools

Open Chrome or Firefox DevTools (F12) -> Network tab, trigger the request, right-click it, and select Copy -> Copy as cURL.

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2. Paste Command into Codeflips

Paste the copied bash cURL command into the input pane. Headers, HTTP verbs, auth tokens, and JSON bodies are detected automatically.

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3. Copy Formatted Fetch Snippet

Copy the ready-to-run JavaScript fetch() snippet with async/await error handling, or adapt it into an Axios request config.

Real Example: cURL to Fetch Input & Transformed Output

Input (cURL Command)TEXT
curl 'https://api.github.com/repos/owner/repo/issues' \
  -X POST \
  -H 'Accept: application/vnd.github.v3+json' \
  -H 'Authorization: Bearer ghp_sampletoken123456789' \
  -H 'Content-Type: application/json' \
  -d '{"title":"Bug Report","body":"Fix hydration error in navigation"}'
Transformed Output (JavaScript Fetch Code)JAVASCRIPT
const response = await fetch('https://api.github.com/repos/owner/repo/issues', {
  method: 'POST',
  headers: {
    'Accept': 'application/vnd.github.v3+json',
    'Authorization': 'Bearer ghp_sampletoken123456789',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    title: 'Bug Report',
    body: 'Fix hydration error in navigation'
  })
});

if (!response.ok) {
  throw new Error(`HTTP error! status: ${response.status}`);
}

const data = await response.json();
console.log(data);

Primary Use Cases for cURL to Fetch

Replicating DevTools Network Requests in Code

Extract exact browser requests including headers and cookies to reproduce API errors in local test scripts or unit tests.

Converting API Documentation Examples

Transform cURL examples from Stripe, OpenAI, Twilio, and GitHub documentation into clean JavaScript client code.

Migrating Terminal Commands to Axios or Fetch

Easily restructure CLI curl parameters into structured options objects for frontend React apps or Node.js microservices.

About the cURL to Fetch Converter

The Codeflips cURL to Fetch converter is a free online tool built for web developers, backend engineers, and QA testers who need to convert cURL to Fetch online free. While API documentation and browser developer tools present network requests as terminal cURL commands, web applications require modern JavaScript fetch() or Axios promises. Our utility instantly bridges this gap with zero configuration.

Capturing requests from browser network inspectors often includes sensitive Authorization Bearer tokens, private session cookies, and internal IP addresses. Uploading these commands to remote web servers creates immediate security vulnerabilities. Codeflips executes 100% in your browser, nothing is uploaded. You get instant translation with complete data sovereignty.

Deep Dive: Engineering & Data Handling

To copy a request from Google Chrome, Firefox, or Safari: press F12, click the Network tab, perform the web action, right-click the desired request row, and select "Copy as cURL". Paste that command into Codeflips to automatically extract request methods (GET, POST, PUT, DELETE, PATCH), authentication headers, query parameters, and JSON payloads. If you distribute client-side JavaScript that calls APIs, consider hardening your bundle with our JavaScript Obfuscator, or transform the resulting JSON payloads into spreadsheets using our JSON to CSV converter.

Technical Architecture & Execution Model

Powered by a client-side shell lexer, this converter handles multi-line line continuations (\), single and double quotes, compression flags (--compressed), URL encodings, and cookie headers. Output code is formatted in clean ES2022 async/await syntax with robust status-code error checks.

• Input Parser: Native JavaScript AST & Web Worker engine
• Output Target: Validated JAVASCRIPT output
• Privacy Guarantee: Runs 100% in your browser, nothing is uploaded

Frequently Asked Questions

How do I convert a cURL command to fetch?↓
To convert a cURL command to fetch, paste your terminal command into the input pane above. Codeflips automatically parses the URL, HTTP method, headers, query strings, and body payload, generating clean modern JavaScript `fetch()` code with async/await error handling. Once your client script receives API responses, you can easily transform the resulting payloads using our JSON to CSV converter.
What is cURL?↓
cURL (short for Client URL) is a widely used command-line utility and library for transferring data across networks using protocols like HTTP, HTTPS, FTP, and WebSockets. It allows developers to test REST endpoints, inspect HTTP response headers, and download files directly from their terminal. Because terminal commands cannot run directly in browser JavaScript, developers convert cURL commands into native fetch calls.
How do I copy a request as cURL from Chrome DevTools?↓
To copy a request as cURL, open Chrome DevTools by pressing F12, switch to the Network tab, and perform the desired action on the page. Right-click the corresponding network call in the request list, navigate to "Copy", and select "Copy as cURL (bash)". You can then paste the full command directly into Codeflips for instant JavaScript conversion.
How do I send a POST request with JSON using fetch?↓
To send a POST request with JSON using fetch, pass an options object as the second argument containing `method: 'POST'`, a `headers` object with `'Content-Type': 'application/json'`, and your payload serialized via `body: JSON.stringify(data)`. Codeflips formats this entire configuration block automatically from `-d`, `--data`, or `--data-raw` command flags.
How do I add headers and an Authorization token in fetch?↓
You add headers and authorization tokens in fetch by passing a `headers` key inside your `fetch(url, options)` request object. For Bearer authentication, include `'Authorization': 'Bearer YOUR_TOKEN'`, alongside other headers like `'Accept': 'application/json'`. Codeflips accurately extracts `-H` and `--header` flags and maps them into a clean, typed JavaScript headers object.
What is the difference between fetch and axios?↓
The primary difference is that `fetch` is a native browser and Node.js standard API requiring no external npm dependencies, whereas Axios is a third-party library. Axios provides automatic JSON data parsing, built-in request interceptors, and rejects promises on HTTP 4xx/5xx errors, whereas `fetch` requires manual checking of `response.ok` and explicit `response.json()` parsing.
Does fetch work in Node.js?↓
Yes, the Fetch API is natively supported in Node.js starting with Node.js version 18. You can use standard `fetch()` in server-side scripts, Next.js API routes, and cloud worker runtimes without installing packages like `node-fetch`. This allows you to share identical data-fetching code across both browser and server environments seamlessly.
Why do I get a CORS error with fetch?↓
A CORS (Cross-Origin Resource Sharing) error occurs because web browsers enforce a security policy blocking frontend JavaScript from accessing resources on a different domain unless the destination server explicitly returns an `Access-Control-Allow-Origin` header. cURL ignores CORS restrictions because it runs directly in the terminal, whereas browser-executed fetch requests are strictly bound by cross-origin security rules.
Is it safe to paste cURL commands that contain tokens?↓
Yes, pasting cURL commands into Codeflips is completely safe because all parsing executes 100% in your local browser memory. Nothing is uploaded, logged, or sent across any network connection. If your command contains private API tokens, session cookies, or internal endpoints, they remain strictly confidential on your machine. To further protect frontend API calls, use our JavaScript Obfuscator.
Which cURL options are not supported?↓
Low-level terminal flags such as certificate pinning (`--cacert`), connection timeouts (`--connect-timeout`), socket binding (`--interface`), and silent mode (`-s`) are not supported because they have no direct equivalent in standard browser JavaScript Fetch APIs. Codeflips focuses on converting HTTP verbs, URLs, headers, cookies, basic authentication, and request bodies into standards-compliant web code.

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