Learn Curl - 10 Code Examples & CST Typing Practice Test
cURL is a command-line tool and library for transferring data with URLs. It supports a vast range of protocols (HTTP, HTTPS, FTP, SMTP, SFTP, etc.) and is widely used for API testing, automation, network debugging, and data transfers.
Learn CURL with Real Code Examples
Updated Nov 21, 2025
Installation Setup
Default on Linux/macOS
Windows 10+ includes curl
Install via package managers if needed
Use curl --version to verify
libcurl available for software development
Environment Setup
Install via OS package manager
Check version
Configure .curlrc
Store API tokens securely
Integrate with shell aliases
Config Files
.curlrc for default flags
Saved certificates
API token files
JSON payload files
Shell scripts with curl commands
Cli Commands
curl -v https://example.com
curl -X POST -d 'a=1'
curl -H 'Auth: token'
curl -O download.zip
curl -F 'file=@path'
Internationalization
UTF-8 support
Locale-aware
Supports global servers
Good for international APIs
Handles multi-language headers
Accessibility
Default on most OS
Small learning curve
Works with screen readers
Simple flags for beginners
Strong documentation
Ui Styling
Terminal output
Colored output via jq
Progress bars
Silent mode
Raw or formatted output
State Management
Cookies via --cookie
Sessions via --cookie-jar
Token files
Proxy environment variables
Configuration in .curlrc
Data Management
Upload/download
JSON payload sending
Header manipulation
Response parsing using jq
File streaming
Frequently Asked Questions about Curl
What is Curl?
cURL is a command-line tool and library for transferring data with URLs. It supports a vast range of protocols (HTTP, HTTPS, FTP, SMTP, SFTP, etc.) and is widely used for API testing, automation, network debugging, and data transfers.
What are the primary use cases for Curl?
Calling REST APIs. Downloading or uploading files. Testing authentication flows. Debugging servers with verbose network logs. Automating data transfers
What are the strengths of Curl?
Massive protocol support. Perfect for API testing. Works everywhere (Linux, macOS, Windows). Reliable and stable for decades. Zero dependencies for most OS installs
What are the limitations of Curl?
Verbose syntax for complex operations. Not a programming language. Hard to read multi-flag commands. Limited JSON parsing (needs jq). Not ideal for browser-style sessions
How can I practice Curl typing speed?
CodeSpeedTest offers 10+ real Curl code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.