NodejsHow-ToBeginner · 3 min read

How to Use http.get in Node.js: Simple Guide with Example

In Node.js, you use http.get to make simple HTTP GET requests by passing a URL and a callback to handle the response. The callback receives a response object where you can listen for data chunks and the end event to process the full response.

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Syntax

The http.get method takes a URL or options object and a callback function. The callback receives a response object to handle the incoming data stream.

url: The URL string or options describing the request.
callback: Function called with the response object.

You listen to data events to receive chunks and end event to know when the response is complete.

javascript

http.get(url[, options][, callback])

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Example

This example shows how to use http.get to fetch data from a website and print the full response body to the console.

javascript

import http from 'http';

const url = 'http://www.example.com';

http.get(url, (res) => {
  let data = '';

  // Listen for data chunks
  res.on('data', (chunk) => {
    data += chunk;
  });

  // When response ends, print the full data
  res.on('end', () => {
    console.log('Response received:');
    console.log(data);
  });

}).on('error', (err) => {
  console.error('Error:', err.message);
});

Output

Response received: <!doctype html>\n<html>\n<head>\n <title>Example Domain</title>\n ... (rest of HTML content) ...

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Common Pitfalls

Common mistakes when using http.get include:

Not listening to the data event, so the response body is never collected.
Not handling the end event, so you try to use incomplete data.
Ignoring errors by not attaching an error event listener.
Using http.get for HTTPS URLs, which requires the https module instead.

javascript

import http from 'http';

// Wrong: Not collecting data chunks
http.get('http://www.example.com', (res) => {
  console.log('Status Code:', res.statusCode);
  // No data event listener here
});

// Right: Collect data and handle errors
http.get('http://www.example.com', (res) => {
  let data = '';
  res.on('data', chunk => data += chunk);
  res.on('end', () => console.log(data));
}).on('error', err => console.error('Error:', err.message));

📊

Quick Reference

http.get(url, callback): Make a GET request to the URL.
res.on('data', callback): Receive chunks of data.
res.on('end', callback): Called when all data is received.
req.on('error', callback): Handle request errors.
Use https.get for HTTPS URLs.

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Key Takeaways

Use http.get with a callback to handle HTTP GET requests in Node.js.

Always listen to data and end events on the response to collect the full data.

Attach an error event listener to handle possible request errors.

Use the https module for HTTPS URLs instead of http.

The response data comes in chunks, so accumulate them before using.