cURL to Fetch Converter

About this tool

Every API doc gives you a cURL command; your frontend needs fetch(). This converter parses the real cURL syntax — -X, -H, -d, -F, -u, -G, quoted arguments, line continuations — and emits idiomatic fetch code with proper headers, JSON bodies and error handling.

Choose async/await or promise chains to match your codebase.

How to use it

1. Copy a cURL command from any API documentation.
2. Paste it into the input.
3. Toggle async/await if you prefer promise chains.
4. Copy the generated JavaScript into your project.

Useful ways to apply it

• Converting API doc examples into working frontend code in seconds.
• Migrating shell scripts to Node.js.
• Teaching teammates what a cURL flag translates to in fetch options.
• Prototyping API calls in the browser console.

Worked example

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

fetch('https://api.example.com/users', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({name:'Ada'}) })

Edge cases to check

• Shell quoting rules differ between Bash, PowerShell and Windows cmd.
• Multipart uploads need FormData rather than a copied multipart boundary.
• Browser fetch is still subject to CORS even when the original cURL request works from a terminal.

Known limitations

The converter preserves common request intent but cannot reproduce every cURL transport option, certificate option, proxy flag or shell expansion.