Does this tool send my curl command anywhere?

No. Parsing and code generation both happen in your browser with JavaScript. The command, headers, and any tokens inside it are never uploaded to a server.

Which curl flags are supported?

-X/--request, -H/--header, -d/--data/--data-raw/--data-binary, -F/--form, -u/--user, -b/--cookie, -A/--user-agent, -e/--referer, -G/--get, and -k/--insecure. Common no-op flags like --compressed, -s, -v, and -L are ignored since URLSession handles them by default.

Why does the body use JSONSerialization instead of a raw string?

When the body starts with { or [ and parses as valid JSON, the tool builds a Swift dictionary and encodes it with JSONSerialization.data(withJSONObject:), which also sets the Content-Type header. Non-JSON bodies use a plain string converted to Data.

What happens with -F form fields?

Each -F field is appended to a multipart/form-data body with the matching boundary. A value starting with @ is treated as a file path and read with Data(contentsOf:), matching how curl uploads files.

What if my curl command spans multiple lines?

Backslash line continuations, the format most terminals and browser "Copy as cURL" buttons produce, are joined automatically before parsing.

Does -b or a Cookie header produce a Cookie request header?

Yes. Both -b and an -H "Cookie: ..." header are set on the generated URLRequest as a Cookie header field, matching what curl sends on the wire.

cURL to Swift

Paste a curl command and get equivalent Swift URLSession code, with headers, JSON body, cookies, and auth already translated.

curl Command

Swift (URLSession)

Summary

Paste a curl command and get equivalent Swift URLSession code, with headers, JSON body, cookies, and auth already translated.

How it works

Paste a curl command, including one copied from a browser devtools network tab.
The parser tokenizes the command, honoring quotes and backslash line continuations.
Flags such as -X, -H, -d, -b, -u, -F, and -G are mapped to URLRequest and URLSession equivalents.
A JSON body is detected automatically and rendered as a Swift dictionary encoded with JSONSerialization.
The generated Swift code appears in the output box, ready to copy into a project.

Use cases

Turn a "Copy as cURL" request from browser devtools into a Swift network call.
Reproduce an API call from documentation or a support ticket in an iOS app.
Convert a curl example from a README into a starting point for a URLSession client.
Debug an API integration by replaying the exact request curl sent, from Swift.
Translate a webhook test command into a repeatable Swift snippet.
Build a quick prototype around a request captured from a mobile app proxy.

Frequently Asked Questions

Last updated: 2026-09-19 · Reviewed by Nham Vu