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cURL Command Builder - Build and Copy cURL Commands

Visually build cURL commands without memorising flags. Set the HTTP method, URL, headers, body (JSON, form, raw), and authentication, then copy the ready-to-run command.

Your inputs are saved in this browser only. No data is ever sent to a server, and saved values won't be visible in other browsers or devices.
curl \
  -L \
  -X GET \
  'https://api.example.com/endpoint'

cURL Command Reference

cURL is a command-line tool for making HTTP (and other protocol) requests. Common flags used by this builder: -X sets the method, -H adds a header, --data sets the request body, -u provides Basic credentials, and -L follows redirects.

Most common curl recipes

TaskCommand
GET requestcurl https://api.example.com/data
POST JSONcurl -X POST -H "Content-Type: application/json" -d '{"key":"value"}' https://api.example.com
POST form datacurl -X POST -d "name=Alice&age=30" https://example.com/form
Bearer token authcurl -H "Authorization: Bearer TOKEN" https://api.example.com
Basic authcurl -u username:password https://example.com
Follow redirectscurl -L https://example.com
Save to filecurl -o output.json https://api.example.com/data
Ignore SSL errors (dev only)curl -k https://self-signed.badssl.com

curl vs. wget

curl: Transfers data to/from a server. Supports many protocols (HTTP, FTP, SMTP). Better for APIs and single requests. Output goes to stdout by default.

wget: Downloads files from the web. Supports recursive downloads (entire websites). Automatically resumes interrupted downloads. Better for bulk file downloads. Output saves to disk by default.

Debugging tips

  • -v (verbose): Show request headers, response headers, and SSL handshake details.
  • --trace / --trace-ascii: Full protocol dump (binary or ASCII). Very detailed.
  • -I / --head: Fetch headers only, no body.
  • -w (write-out): Print timing stats like total time, DNS lookup time, connect time: -w "@curl-format.txt"
  • --compressed: Request and decompress gzip/deflate responses automatically.

Platform differences

Linux/Mac: Use single quotes around JSON strings to prevent shell interpretation: curl -d '{"key":"value"}'

Windows PowerShell/cmd: Single quotes are treated as literal characters. Use double quotes and escape inner quotes with backslashes: curl -d "{\"key\":\"value\"}" or use @file.json to read from a file.

Security Note

Credentials entered here never leave your browser. However, avoid sharing generated commands that contain real tokens or passwords in logs or public issue trackers.