JavaScript Parsing JSON: Proxy IP Processing API Data

I. Relationship between proxy IP and JSON data

A lot of partners just started to contact the proxy IP, will encounter a headache: obviously got the API interface, the return data but do not know how to use. Here to emphasize--Most Proxy IP Service Providers(such as our ipipgo) are returned in JSON format data.

As a chestnut, the proxy IP data you get from ipipgo might look like this:

{
  "status": "success",
  "data": [
    {"ip": "123.45.67.89", "port": 8000}, {"status": "success", "data": [
    {"ip": "98.76.54.32", "port": 8080}
  ]
}

This is the time to use JavaScript todisassembleThis packet, extract the IP address and port number inside. Just like unpacking a courier, the outer package (JSON structure) is unpacked to get to the baby inside (proxy IP information).

Second, hands-on analysis of the actual combat

Let's get right to the hard stuff, assuming we've already got the proxy data through the ipipgo API:

// Send a request to get the proxy IP
fetch('https://api.ipipgo.com/getProxy')
  .then(response => response.json())
  .then(data => {
    // First layer of shields: checking status
    if(data.status === 'success') {
      // Second layer of disassembly: traversing the list of proxies
      data.data.forEach(proxy => {
        console.log(`Available proxies: ${proxy.ip}:${proxy.port}`); }); // The second level of disassembly: traverse the proxy list.
      });
    }
  });

Note these two key points:

III. Pitfalls in real projects

Three common mistakes newbies make:

1. No status check.: take data.data directly, in case the interface returns an error it will report an error directly
2. invoke using a dead loop (idiom); to execute a call in a dead-end loop: Frequent requests to the API may trigger wind control (ipipgo's smart scheduling avoids this problem)
3. The formatting is not aligned.: The port number is sometimes a string and sometimes a number, remember to use Number() to convert it.

It is recommended that exception handling be added:

try {
  const proxies = JSON.parse(rawData).data;
} catch (e) {
  console.log('Parsing failed, suggest switching to ipipgo's alternate interface'); }
}

IV. Practical Scenario Teaching

Give an example of usage in a crawler project:

async function getProxyList() {
  const response = await fetch('https://api.ipipgo.com/batchProxy');
  const { data } = await response.json();

  // Pick a random proxy to use
  const randomProxy = data[Math.floor(Math.random()data.length)];
  return `http://${randomProxy.ip}:${randomProxy.port}`;
}

This way, each request will randomly use a new proxy to avoid being blocked by the target website. ipipgo'sHigh Stash Proxy PoolIt is especially suitable for this kind of scenario where frequent switching is required.

V. Frequently Asked Questions QA

Q: Why can't the agent I got connect?
A: First check if the IP and port are spliced correctly, then test if the proxy is expired. Recommended to use ipipgo'sReal-Time Authentication InterfaceThe survival rate is 99%.

Q: How do you handle large amounts of proxy data?
A: You can use the map method to batch process:

const proxyList = data.map(item => ({
  host: item.ip,
  port: item.port
}));

Q: What should I do if the agent is suddenly unavailable?
A: It is recommended to include a retry mechanism in the code, and also to choose a program like ipipgoAuto Refresh IP Poolservice provider

VI. Why recommend ipipgo

1. Return data formatclean and standardizedI don't have to deal with a messy structure.
2. ProvisionMulti-language sample codeThe most comprehensive JavaScript support in the world.
3. ExclusiveIP Health DetectionSaves you the trouble of having to verify it yourself
4. Free trial for new users500 timesAPI calls, enough to practice

As a final reminder, be careful when dealing with proxy IPsFault Tolerance of Code. Just like driving a car to wear a seat belt, the code should also do a good job of exception handling. Students who have just started can directly use the SDK provided by ipipgo, which has helped you encapsulate a variety of protective measures.