Javascript Programming Tutorials, Guides & Best Practices

• JavaScript enables features like dropdown menus, modal windows, sliders, and real-time updates.
• Examples: Search suggestions, form validations, chat applications.

• Using AJAX or Fetch API, JavaScript retrieves and updates data without reloading the page.
• Example: Infinite scrolling on social media feeds.

With the Fetch API:

• The fetch() method returns a Promise that resolves to the Response object representing the entire HTTP response.
• We check if the response is successful and then parse it as JSON.
• Any errors during the request are caught and logged.

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const apiUrl = 'https://api.example.com/data';
const requestData = {
    name: 'John Doe',
    age: 30,
};

// Send a POST request using fetch
fetch(apiUrl, {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json', // Specify JSON content type
    },
    body: JSON.stringify(requestData), // Convert data to JSON string
})
    .then(response => {
        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }
        return response.json();
    })
    .then(data => {
        console.log('Success:', data); // Handle successful response
    })
    .catch(error => {
        console.error('Error:', error); // Handle errors
    });