curl ↔ fetch ↔ axios Converter
Convert any cURL command to JavaScript fetch or axios - and back, with auto-detection.
Convert any cURL command to JavaScript fetch or axios - and back, with auto-detection.
This free curl ↔ fetch ↔ axios Converter from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the curl ↔ fetch ↔ axios Converter
- Paste your input - JSON, regex pattern, JWT, URL etc.
- Pick any flags or options the tool supports.
- Click the action button (Format, Test, Decode).
- Copy the result or download it as a file.
What you can do with the curl ↔ fetch ↔ axios Converter
- Format and validate API responses while debugging.
- Test regex patterns against real input before deploying.
- Decode JWTs to inspect claims and expiry.
- Generate UUIDs for migrations, tests and seeders.
Why use KX Toolkit's curl ↔ fetch ↔ axios Converter
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
Bookmark the most-used tools - your browser bookmark bar is faster than retyping the URL every time.
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What does the converter actually do?
You paste a curl command, a fetch() call, or an axios call, and the tool produces all three forms. It detects the input type from the leading token (curl, fetch( or axios.) and parses headers, method, body, and basic auth. Output blocks are editable and have a copy button. Everything happens in your browser - no requests are made and no data is uploaded.
Which curl flags are recognised?
The common ones used in API examples: -X / --request, -H / --header, -d / --data / --data-raw / --data-binary / --data-urlencode, -u / --user (basic auth), --url, -G / --get, -I / --head, -A / --user-agent, -e / --referer, -b / --cookie. Less common flags are skipped with a best-effort attempt to consume their argument. Multipart -F is not converted because fetch and axios handle file uploads differently.
Can I paste a fetch call I copied from DevTools?
Yes, that is one of the main use cases. Chrome DevTools "Copy as fetch" produces the same shape this tool understands: fetch("url", { method, headers, body }). The body may be a JSON.stringify(...) call, which is parsed correctly. If the call contains JavaScript-only syntax (template literals with substitutions, spread operators), parsing may fall back gracefully or report an error.
Why is the generated body wrapped in JSON.stringify?
When the request body looks like valid JSON, both fetch and axios benefit from a parsed object literal in the source. fetch needs the body as a string, so JSON.stringify wraps the literal. axios sends the literal directly because its data parameter accepts an object and serialises it. Non-JSON bodies are emitted as plain quoted strings so form-encoded or raw payloads still work.
Does it handle authentication headers?
Yes. -H "Authorization: Bearer ..." passes through to both fetch and axios as a header. Curl basic auth via -u user:pass is converted to a base64 Authorization header automatically. Cookies via -b are converted to a Cookie header. Note that fetch in browsers will not send a Cookie header set this way unless credentials are configured - the generated code is meant for Node.js or for understanding the request shape.
Is the parser exact?
It handles the curl shapes you actually see in API documentation: single and double quoted arguments, backslash-newline continuations, multiple -H flags, embedded JSON. It is not a full POSIX shell parser, so commands that rely on environment variables, shell substitution, or piped input will not round-trip. For those, hand-edit the output. Privacy: nothing leaves the page.
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