What is cURL? Complete Guide to cURL Commands, Options & API Testing

cURL is one of those tools that every developer encounters at some point in their career. Whether you’re testing APIs, debugging network issues, or automating data transfers, cURL is an indispensable command-line companion. In this comprehensive guide, we’ll explore everything you need to know about cURL, from the basics to advanced usage and testing workflows. What is cURL? cURL (Client URL) is a free, open-source command-line tool and library for transferring data using various network protocols. Created by Daniel Stenberg in 1997, cURL has become the de facto standard for making HTTP requests from the terminal. At its core, cURL is designed to work with URLs. The name itself is a play on “see URL” – it allows you to interact with URLs directly from your command line without needing a browser or GUI application. Key Features Protocol Support: cURL supports an impressive array of protocols including HTTP, HTTPS, FTP, SFTP, SCP, TELNET, LDAP, and many more. This versatility makes it us