Fetch API & Network Requests
Connect to the world! Learn to use the Fetch API to get data from servers and APIs.
Connect to the world! Learn to use the Fetch API to get data from servers and APIs. This hands-on tutorial focuses on practical implementation of fetch api & network requests concepts.
Fetch API & Network Requests
Your JavaScript code lives in a browser, but the data lives on a server. The Fetch API is the bridge that connects them.
1. What is Fetch? 🌐
What is it? A built-in JavaScript function to make HTTP requests (like GET, POST) to servers.
Why use it?
- Get data (e.g., load a list of products).
- Send data (e.g., submit a login form).
- It uses Promises, making it easier to handle asynchronous operations.
2. Basic GET Request 📥
Fetching data is a 2-step process:
- Call
fetch()to get the Response. - Call
response.json()to extract the Data.
3. Modern Syntax: Async/Await ⚡
Using .then() chains can get messy. async/await makes your code look synchronous and clean.
4. Sending Data (POST) 📤
To send data (like creating a new user), you need to add options to fetch.
5. Handling Errors Correctly 🛡️
Important: fetch() does NOT throw an error for 404 (Not Found) or 500 (Server Error). It only fails if the network is down.
You must check response.ok.
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Quiz
Quiz
Question 1 of 4What does fetch() return?
Key Takeaways
✅ fetch() is the standard way to get data.
✅ async/await is cleaner than .then().
✅ response.json() parses the data.
✅ Check response.ok for HTTP errors.
✅ Use POST and JSON.stringify to send data.
What's Next?
We used async/await here, but how does it really work? Let's dive deep into Async JavaScript in the next chapter!
Keep coding! 🚀