curl to fetch Converter
This tool turns a curl command into a ready-to-run JavaScript fetch() call
This tool turns a curl command into a ready-to-run JavaScript fetch() call
How to use curl to fetch Converter
- Paste your curl command into the input box.
- Choose the output style and credentials mode you want.
- Copy the generated JavaScript fetch() code into your project.
About curl to fetch Converter
This tool turns a curl command into a ready-to-run JavaScript fetch() call. Paste the curl command you copied from your browser's network tab, API docs, or a colleague, and it parses the method, headers, request body, and basic-auth credentials into clean fetch code you can drop straight into your app. You can pick between async/await and a .then() promise chain, and set the credentials mode for sending cookies.
It parses curl the way a shell does: single quotes, double quotes, backslash escapes, and multi-line commands using backslash or caret line continuations all work. It recognizes -X/--request, -H/--header, -d/--data (and its variants), --data-urlencode, -F/--form for multipart uploads, and -u/--user for basic auth, which it base64-encodes into an Authorization header. Common curl-only flags like --compressed, -L, and -k are safely ignored because they have no fetch equivalent.
Everything runs locally in your browser using plain JavaScript. Nothing is uploaded and no request is ever sent, so you can convert commands that contain tokens or credentials without them leaving your machine. Two honest limits: file uploads (-F field=@file) become a commented placeholder since a browser needs a real File object from an input, and fetch cannot bypass CORS or TLS verification the way some curl flags do.
Frequently asked questions
- How do I convert a curl command to fetch?
- Paste your full curl command into the box. The tool instantly parses it and shows the equivalent JavaScript fetch() call below, which you can copy with one click. It updates as you type or change the output options.
- Does it handle POST requests with JSON or form data?
- Yes. A -d/--data body with a JSON header becomes a string body, --data-urlencode builds a URLSearchParams object, and -F/--form builds a FormData object. The HTTP method defaults to POST automatically whenever a body is present and no -X is given.
- Is my curl command sent anywhere or stored?
- No. All parsing and code generation happen entirely in your browser with plain JavaScript. Your command, including any tokens or credentials, never leaves your device and nothing is uploaded or logged.
- What happens to basic auth and file uploads?
- A -u user:pass flag is base64-encoded into an Authorization: Basic header. File uploads written as -F field=@file.png become a commented placeholder, because a browser must supply a real File object from a file input rather than a path.
- Can I choose async/await or a promise chain?
- Yes. Use the output style selector to switch between an async/await version and a .then() promise chain. You can also set the credentials mode to include or same-origin so fetch sends cookies.
- Why are some curl flags missing from the output?
- Flags like --compressed, -L/--location, -k/--insecure, and -s/--silent control curl's own behavior and have no direct fetch equivalent, so they are recognized and skipped rather than producing invalid code.