cURL to Fetch Converter Guide
Convert cURL commands to JavaScript fetch, axios, and Node.js http — with headers, body, and auth.
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Tags: curl to fetch converter, cURL JavaScript equivalent, convert curl to code
cURL to Fetch Converter Guide API documentation almost always provides cURL examples. Frontend developers need those same requests in JavaScript fetch, and the translation between cURL flags and fetch options isn't always obvious. A cURL-to-fetch converter handles the mechanical mapping — this guide explains what each cURL flag means in fetch terms so you understand the output. --- All the tools discussed here are available for free at theproductguy.in — client-side, no sign-up required. Part of the HTTP Debugging Tools Guide — a complete toolkit for diagnosing web requests. --- What is The Flag-by-Flag Translation? -X: HTTP Method GET is the default for both cURL and fetch — you only need to specify other methods explicitly. --- -H: Request Headers Each flag in cURL becomes one property…
Frequently Asked Questions
How do I convert a cURL command to fetch?
Map cURL flags to fetch options: -X sets method, -H adds headers to the headers object, -d or --data sets the body, -u sets Authorization via Basic auth encoding, and --cookie adds a Cookie header. A cURL-to-fetch converter handles the translation automatically, including URL-encoded and JSON bodies.
What is the fetch API equivalent of cURL -H?
The -H flag in cURL adds a request header. In fetch, headers go in the headers property of the options object: fetch(url, { headers: { 'Header-Name': 'value' } }). Multiple -H flags in cURL become multiple properties in the headers object.
How do I set headers in fetch?
Pass a headers object as the second argument to fetch: fetch(url, { headers: { 'Authorization': 'Bearer token', 'Content-Type': 'application/json' } }). You can also use the Headers constructor: new Headers({ ... }) which provides case-insensitive header management.
How do I send a POST request with fetch?
Set method to 'POST', add Content-Type to headers, and provide a body: fetch(url, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(data) }). For form data, use body: new FormData() or body: new URLSearchParams() with the matching Content-Type.
How do I use cURL with cookies?
In cURL, use -b 'name=value' to send a cookie or -b cookiefile to read from a file, and -c cookiefile to save received cookies. In fetch, include credentials: 'include' to send and receive cookies for same-origin requests, or credentials: 'include' plus CORS headers for cross-origin requests. You can also set the Cookie header manually.
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