What is a cURL command?

cURL (Client URL) is a command-line tool for making HTTP requests. It supports all HTTP methods (GET, POST, PUT, DELETE, etc.) and lets you set headers, send request bodies, handle authentication, follow redirects, and more. It's widely used for testing APIs and downloading files.

How do I send a POST request with JSON using cURL?

Use the -X POST flag for the method, -H "Content-Type: application/json" to set the header, and -d '{"key":"value"}' for the body. The cURL Builder generates this automatically when you select POST, add the header, and enter your JSON body.

What does the -k flag do in cURL?

The -k (or --insecure) flag tells cURL to skip SSL certificate verification. This is useful for testing on local development servers with self-signed certificates. Never use -k in production requests as it disables security checks and exposes you to man-in-the-middle attacks.

How do I add authentication headers with cURL?

Add a header with key Authorization and value Bearer your-token for token-based auth. For Basic Auth, cURL also supports -u username:password which encodes it automatically. Use the Headers section in the cURL Builder to add any custom headers.

Can I use this cURL builder offline?

Yes, the cURL Builder generates commands entirely in your browser. No internet connection is needed to build commands, and your API keys or request data are never sent to our servers.

cURL Command Builder

Build cURL commands visually. Set HTTP method, URL, headers, request body, and options, then copy the generated command.

Request

Method

URL

Headers

Generated cURL Command

curl "https://api.example.com/endpoint"

How to Use

Build cURL commands visually. Set HTTP method, URL, headers, request body, and options, then copy the generated command.

1Select your HTTP method (GET, POST, PUT, PATCH, DELETE, etc.).
2Enter the URL of the API endpoint you want to call.
3Add request headers by clicking 'Add Header' and entering key-value pairs.
4For POST/PUT/PATCH requests, enter your request body in JSON or raw format.
5Toggle options like follow redirects, verbose, or insecure as needed.
6Copy the generated cURL command from the output box.

Key Features

Supports all HTTP methods: GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS
Dynamic headers — add as many key-value pairs as you need
JSON, raw, and form data body types for POST/PUT/PATCH
Options for redirects (-L), verbose (-v), insecure (-k), and more
Generated command formatted for terminal with proper line breaks

Frequently Asked Questions

Learn More

cURL for Developers: Stop Googling the Flags and Start Building Commands