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Node.js Stream writable.writableLength Property

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  • Last Updated : 05 Aug, 2022
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The writable.writableLength property is an inbuilt application of stream module which is used to check the number of bytes in the queue that is ready to be written. 

Syntax:

writable.writableLength

Return Value: This property returns the number of bytes that is ready to write into the queue. 

Below examples illustrate the use of writable.writableLength property in Node.js: 

Example 1: 

javascript




// Node.js program to demonstrate the    
// writable.writableLength Property
 
// Accessing stream module
const stream = require('stream');
 
// Creating a stream and creating
// a write function
const writable = new stream.Writable({
 
  // Write function with its
  // parameters
  write: function(chunk, encoding, next) {
 
    // Converting the chunk of
    // data to string
    console.log(chunk.toString());
    next();
  }
});
 
// Calling cork() function
writable.cork();
 
 //Writing data
writable.write('hi');
 
// Again writing some data
writable.write('GFG');
 
// Calling writable.writableLength
// Property
console.log(writable.writableLength);


Output:

5

Example 2: 

javascript




// Node.js program to demonstrate the    
// writable.writableLength Property
 
// Accessing stream module
const stream = require('stream');
 
// Creating a stream and creating
// a write function
const writable = new stream.Writable({
 
  // Write function with its
  // parameters
  write: function(chunk, encoding, next) {
 
    // Converting the chunk of
    // data to string
    console.log(chunk.toString());
    next();
  }
});
 
// Calling cork() function
writable.cork();
 
 //Writing data
writable.write('hi');
 
// Calling uncork() function
writable.uncork();
 
// Again calling cork function
writable.cork();
 
// Again writing some data
writable.write('GFG');
 
// Calling writable.writableLength
// Property
console.log(writable.writableLength);


Output:

hi
3

Here, the data ‘hi’ is not present in buffer anymore So, the buffer has only 3 bytes present data ‘GFG’ takes 3 bytes. 

Reference: https://nodejs.org/api/stream.html#stream_writable_writablelength


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