Node.js Stream readable.setEncoding() Method

Last Updated : 12 Oct, 2021
The readable.setEncoding() method in a Readable Stream is used to set the encoding of the data read. Syntax: 
readable.setEncoding( encoding )
Parameters: This method accepts single parameter encoding which holds the encoding type. Return Value: It returns the data in the encoded form. Below examples illustrate the use of readable.setEncoding() method in Node.js: Example 1: javascript 
// Node.js program to demonstrate the     
// readable.setEncoding() method  

// Include fs module
const fs = require('fs');

// Create readable stream
const readable = fs.createReadStream("input.txt");

// Calling setEncoding method
readable.setEncoding('hex');

// Handling data event
readable.on('data', (chunk) => {
  console.log(`${chunk}`);
});

// Displays that program 
// is ended
console.log("Program ends!!");
Output: 
Program ends!!
48656c6c6f
Example 2: javascript 
// Node.js program to demonstrate the     
// readable.setEncoding() method  

// Include fs module
const fs = require('fs');

// Create readable stream
const readable = fs.createReadStream("input.txt");

// Calling setEncoding method
readable.setEncoding('base64');

// Handling data event
readable.on('data', (chunk) => {
  console.log(`${chunk}`);
});

// Displays that program 
// is ended
console.log("Program ends!!");
Output: 
Program ends!!
SGVs
bG8=
Reference: https://nodejs.org/api/stream.html#stream_readable_setencoding_encoding
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