cURL to Fetch
Convert a cURL command into equivalent JavaScript fetch() code with headers and body. Runs entirely in your browser.
How to use cURL to Fetch: Open cURL to Fetch — it runs entirely in your browser with no setup. Paste or type your input into the text area, or upload a file where supported. Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server. Everything runs inside your browser, so your data never leaves your device.
Tip: drag a text file onto the box above to load it.
Convert a cURL command into equivalent JavaScript fetch() code with headers and body. Runs entirely in your browser. cURL to Fetch is a free, browser-based tool in the Filevane developer tools collection — there is nothing to install, no account to create and no watermark on your results. It works on desktop, tablet and mobile, and because the work happens on your own device it stays fast even with large inputs.
How to use cURL to Fetch
- Open cURL to Fetch — it runs entirely in your browser with no setup.
- Paste or type your input into the text area, or upload a file where supported.
- Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server.
- Review the output instantly; large inputs are handled locally without lag.
- Copy the result to your clipboard or download it. Your data never leaves the page.
Why use cURL to Fetch?
- 100% free with no limits, no sign-up and no watermarks.
- Private by design — your data are processed in your browser and never uploaded to a server.
- Fast and lightweight, with instant results even on a phone or a slow connection.
- Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
- Part of a full developer tools suite, so related curl to fetch tasks are one click away.
Is it private and secure?
Your privacy is built in. cURL to Fetch runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.
Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.
You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.
Learn more
Is It Safe to Paste Production Data Into Online Tools? — JWTs, API responses and env files get pasted into online formatters every day. Here's what actually happens to that data and how to check before you paste.
Frequently asked questions
How do I convert a cURL command to fetch?
Paste the command and the equivalent JavaScript fetch() call is generated: -X becomes method, -H becomes the headers object, and -d or --data becomes body. Copying a request straight out of your browser's Network tab as cURL is the fastest way to reproduce it in code.
Why does my converted request fail with a CORS error?
Because cURL is not a browser and ignores the same-origin policy entirely. A request that works in the terminal will be blocked in a page unless the server sends the right Access-Control-Allow-Origin headers — the conversion is correct, the environment is not.
How are cookies handled?
cURL's -b sends cookies explicitly. In fetch, cookies come from the browser's own store and are only included when you set credentials: 'include' for cross-origin requests, or 'same-origin' for same-site ones.
What about -F multipart form uploads?
Those become a FormData object rather than a string body. Do not set Content-Type manually for these — the browser must generate it so it can include the multipart boundary.
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