How to implement rotating proxy IP in Node.js?

Below we will show a simple example of how to implement rotating proxy IP in Node.js. We will use the axios library to make HTTP requests and implement IP rotation through a proxy list.

Preparation

First, make sure you have installed Node.js and npm, then run the following command in the project directory to install axios:

Next, we will create a proxyList.js file to store the proxy IPs we need:

Create a request function

Next, we will create a function in the main file to rotate the proxy IP and send a request:

In the above code, we first import the proxy list. Each time the fetchData function is called, the proxy rotation will be implemented by taking the remainder operation. In this way, each request will use a different proxy, thus reducing the risk of being blocked.

Handling failed requests

Failure is a common situation in network requests. We need to add a mechanism to handle the retry logic after the request fails to ensure that the request can be successfully completed. We can add the retry function in the fetchData function:

In this modified version, we added a retries parameter, which defaults to 3. Whenever a request fails, the program will check whether there are retries. If so, the fetchData function will be called to retry.

Proxy IP selection

Choosing the right proxy IP is crucial to the success of data scraping. Here are some considerations when choosing a proxy IP:

Stability: Make sure that the proxy IP can be used for a long time to avoid frequent disconnections.

Speed: Choosing a fast proxy can improve the efficiency of data scraping.

Geographic location: Choose a suitable geographic location according to your needs to obtain more accurate data.

Anonymity: Choose a high-anonymity proxy to ensure privacy and security.

Conclusion

Using rotating proxy IPs is an effective way to avoid IP blocking and tracking, especially in the scenarios of data scraping and automated testing. Through Node.js, we can easily implement this mechanism to improve network security and crawling efficiency. With the continuous development of the Internet, the use of proxy IP will become more and more common, and understanding its application skills will be of great benefit to your work.