cURL Command Builder

The cURL Command Builder is a visual tool that helps you construct cURL commands for HTTP requests without memorizing the syntax. Select a request type, fill in the parameters, choose optional flags, and get a ready-to-run cURL command you can paste directly into your terminal.

The tool supports all common HTTP methods including GET, POST, PUT, PATCH, DELETE, and HEAD. It also provides specialized commands for authentication flows, file uploads/downloads, and advanced options like proxy routing, cookie handling, and retry logic.

No installation is required to build commands with this tool — it runs entirely in your browser. However, you will need cURL installed on your system to execute the generated commands. cURL is pre-installed on most Linux, macOS, and modern Windows systems.

Navigate to the 'Headers & Data' category and select 'JSON Body POST'. Fill in the URL and JSON body fields. The tool automatically adds the correct Content-Type: application/json header. You can also add optional headers like Accept: application/json.

Select the 'Authentication' category. You can choose from Basic Auth (username/password), Bearer Token (JWT or OAuth2 access token), API Key Header (for X-API-Key style headers), or OAuth2 Client Credentials flow. Each option generates the correct cURL flags for the auth type.

The --insecure flag (also written as -k) tells cURL to skip SSL/TLS certificate verification. This is useful for testing against local development servers with self-signed certificates, but should never be used in production as it exposes you to man-in-the-middle attacks.

Enable the 'Follow redirects' option (--location or -L flag) in the Command Options section. This tells cURL to automatically follow HTTP 3xx redirects until it reaches the final destination URL.

Yes! Select the 'File Transfer' category and choose 'Download File'. Enter the URL and the desired output filename. You can add options like --progress-bar to see download progress or --continue-at to resume interrupted downloads.

--data (or -d) sends the data as a raw request body, typically used for JSON or URL-encoded form data with Content-Type: application/x-www-form-urlencoded. --form (or -F) sends multipart/form-data, which is the format used by HTML file upload forms and supports uploading files with @filename syntax.

Use the 'Custom Headers' command in the 'Headers & Data' category and enable the 'Second header' option to add a second -H flag. For more headers, you can copy the generated command and manually append additional --header 'Name: Value' flags.

The --verbose flag (or -v) makes cURL print detailed information about the request and response, including the full HTTP headers sent and received, SSL handshake details, and connection information. It is invaluable for debugging API calls and diagnosing connection issues.

The generated commands use standard cURL syntax compatible with Linux, macOS, and Windows (via Git Bash, WSL, or PowerShell with cURL installed). Note that single-quote syntax for --data values may need to be adapted on Windows Command Prompt — use double quotes and escape inner quotes instead.