How to Convert Short URLs to Long URLs in JavaScript Using Axios or Fetch

Converting short URLs to long URLs is a common task in web development, especially when dealing with redirects. This article will explore how to achieve this using JavaScript and two popular libraries, Axios and the Fetch API. We will demonstrate how to retrieve the full URL from a shortened TikTok link.

Use Axios

Axios is a Promise-based HTTP client for browsers and Node.js. Below is a simple example of how to use Axios to convert a short URL into a long format.

axios("https://vt.tiktok.com/ZS6yXCpvq/")
  .then(res => console.log(`Axios获取的完整URL: ${res.request.res.responseUrl}`))
  .catch(err => console.error(err));

// Complete URL obtained by Axios: https://www.php.cn/link/99ec8b626a47132c52969dd081cdd808

Instructions:

• We use axios() to initiate a GET request for the short URL.
• On success, the response object contains a property res.request.res.responseUrl, which holds the full URL following any redirects.
• If an error occurs during the request, it will be caught in the catch block and we will log the error message.

Use Fetch

Fetch API provides a more modern way of making network requests. Here's how to use it to get the same results:

fetch("https://vt.tiktok.com/ZS6yXCpvq/")
  .then(res => res.text())
  .then(data => console.log(`Fetch获取的完整URL: ${data}`))
  .catch(err => console.error(err));

// Complete URL obtained by Fetch: https://www.php.cn/link/99ec8b626a47132c52969dd081cdd808

Instructions:

• The fetch() function initiates a request to the specified URL.
• The res.url property contains the final URL after any redirects. (Note: The use of res.url in the original answer may not be accurate. Depending on the actual situation, res.text() should be used to obtain the final URL)
• Similar to Axios, errors are handled in catch blocks.

Conclusion

Axios and Fetch both provide easy ways to convert short URLs into long URLs in JavaScript. While Axios may offer additional features like interceptors and automatic JSON data conversion, Fetch is built into modern browsers and is powerful for basic requests. Depending on your project needs, you can choose either method to handle URL redirects.

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