Getting Started with cURL
What Is cURL? A Beginner-Friendly Guide to Talking With Servers From Your Terminal
Before learning cURL, I always thought websites and APIs were only accessible through browsers or apps. But then I realized — browsers are just one way to talk to servers. Developers often talk to servers directly using the terminal.
That’s where cURL comes in.
Let’s understand this step by step, without overcomplicating things.
First, What Is a Server? (In Simple Words)
A server is just another computer on the internet that stores data or provides services.
Examples:
A website server sends HTML pages
An API server sends JSON data
A mail server sends emails
Whenever you open a website or use an app, your device is basically sending a request to a server and waiting for a response.
What Is cURL? (Very Simple Explanation)
cURL is a command-line tool that lets you send requests to servers.
Instead of clicking buttons in a browser, you type commands in the terminal.
In simple words:
👉 cURL is a way to send messages to a server from your terminal and see the response.
It works with websites, APIs, files, and many internet services.
Why Do Programmers Need cURL?
Programmers use cURL because it is:
Fast
Simple
Works everywhere
Great for testing APIs
Useful for debugging server issues
Instead of building a full frontend just to test something, developers quickly use cURL to check:
Is my API working?
Is the server responding?
What data is coming back?
It saves time and gives direct control.
Making Your First Request Using cURL
Let’s start with the simplest example.
Open your terminal and type:
curl https://example.com
Press Enter.
What just happened?
You told cURL:
👉 “Go to this website and bring me whatever the server sends back.”
And the server responded with the website’s HTML content.
Congratulations 🎉
You just made your first HTTP request using cURL.
Understanding Request and Response
Whenever you use cURL, two things are always happening:
1. Request (You → Server)
You are asking the server for something.
Example:
Give me this webpage
Send me user data
Save this information
2. Response (Server → You)
The server replies with:
Status (success or error)
Data (HTML, JSON, text, etc.)
If everything goes well, you usually get a 200 OK response, which means the request was successful.
Think of it like ordering food:
You place an order (request)
Restaurant gives food (response)
Using cURL to Talk to APIs
APIs are just servers that return data instead of webpages.
Example:
curl https://api.github.com
You will see JSON data instead of HTML.
This is how developers test APIs without opening Postman or building apps.
Introducing GET and POST (Only the Basics)
There are many request types, but beginners only need to know two:
GET Request (Getting Data)
GET is used to fetch data.
Example:
curl https://api.example.com/users
This means:
👉 “Give me the list of users.”
POST Request (Sending Data)
POST is used to send data to the server.
Example idea:
curl -X POST https://api.example.com/users
This means:
👉 “I want to send new data to this server.”
Just remember:
GET = receive data
POST = send data
Common Mistakes Beginners Make With cURL
When I started using cURL, I made some of these mistakes too 😅
Here are common ones:
1. Forgetting https
Using:
curl example.com
Sometimes fails.
Better:
curl https://example.com
2. Confusing Browser Output With API Output
Websites return HTML.
APIs return JSON.
Seeing raw data in terminal is normal. It’s not an error.
3. Overusing Flags Too Early
Many tutorials throw too many options at beginners.
You don’t need all that at the start.
Focus first on:
Simple GET
Understanding responses
Reading output
4. Thinking Errors Mean Something Is Broken
If you see errors like 404 or 401, it doesn’t always mean cURL is wrong.
It usually means:
Wrong URL
Missing permission
Resource not found
Errors are part of learning.
cURL may look boring at first because it has no UI and no buttons. But once you understand it, you realize how powerful it is.
It gives you a direct line to servers.
No browser.
No frontend.
Just you and the server.
If you’re learning web development or backend, cURL is one of those small tools that makes you feel more confident as a developer.
