What is chunk in Node.js ?
The data is a transfer from server to client for a particular request in the form of a stream. The stream contains chunks. A chunk is a fragment of the data that is sent by the client to server all chunks concepts to each other to make a buffer of the stream then the buffer is converted into meaningful data. In this article, we will discuss how to send chunks from the request body to the server. The request object is used for handling the chunks of data.
Syntax:
request.on('eventName',callback)
Parameters: This function accepts the following two parameters:
- eventName: It is the name of the event that fired
- callback: It is the Callback function i.e Event handler of the particular event.
Return type: The return type of this method is void.
Example: Create an index.js file with the following code.
index.js
// Importing http libraries const http = require('http'); // Creating a server const server = http.createServer((req, res) => { const url = req.url; const method = req.method; if (url === '/') { // Sending the response res.write('<html>'); res.write('<head><title>Enter Message</title><head>'); res.write(`<body><form action="/message" method="POST"> <input type="text" name="message"></input> <button type="submit">Send</button></form></body></html>`); res.write('</html>'); return res.end(); } // Handling different routes for different type request if (url === '/message' && method === 'POST') { const body = []; req.on('data', (chunk) => { // Storing the chunk data body.push(chunk); console.log(body) }); req.on('end', () => { // Parsing the chunk data const parsedBody = Buffer.concat(body).toString(); const message = parsedBody.split('=')[1]; // Printing the data console.log(message); }); res.statusCode = 302; res.setHeader('Location', '/'); return res.end(); } }); // Starting the server server.listen(3000); |
Run index.js file using below command:
node index.js
Now open a browser and go to http://localhost:3000, you will see the following output.
Console Output:
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