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Aviral Srivastava
Aviral Srivastava

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Fetch API and AJAX

Fetch API vs. AJAX: A Modern Comparison

Introduction:

Both Fetch API and AJAX are used for making asynchronous HTTP requests from web browsers to servers, crucial for dynamic web applications. However, Fetch API is a more modern and streamlined alternative to the older AJAX approach.

Prerequisites:

Both require a basic understanding of JavaScript and HTTP requests. For Fetch API, familiarity with Promises is beneficial.

Features:

  • AJAX (Asynchronous JavaScript and XML): Traditionally uses XMLHttpRequest object. It handles requests and responses directly, often needing manual handling of status codes and error conditions. Example (simplified): 
let xhr = new XMLHttpRequest();
xhr.open('GET', 'url');
xhr.onload = function() {
  // Handle response
};
xhr.send();
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  • Fetch API: Uses Promises for a cleaner, more readable syntax. It provides a higher-level interface, simplifying error handling and response processing. Example: 
fetch('url')
  .then(response => response.json())
  .then(data => {
    // Process data
  })
  .catch(error => {
    // Handle errors
  });
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Advantages and Disadvantages:

Feature Fetch API AJAX
Syntax Cleaner, more readable with Promises More verbose, complex error handling
Error Handling Built-in, easier to manage Manual, prone to errors
Browser Support Widely supported in modern browsers Widely supported, but older methods exist
Progress Updates Less direct support compared to AJAX Offers more granular progress updates

Advantages of Fetch: More modern, cleaner syntax, built-in error handling, easier to use with Promises.

Disadvantages of Fetch: Less control over low-level aspects compared to AJAX (like upload progress).

Conclusion:

Fetch API offers a significant improvement over AJAX in terms of simplicity and readability. While AJAX remains functional and widely supported, for new projects, the Fetch API is generally preferred for its modern approach and ease of use. The choice depends on project needs and browser compatibility requirements. If fine-grained control over the request is paramount, AJAX may still be necessary; however, for most modern web applications, Fetch API provides a more efficient and maintainable solution.

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