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Node.js zlib.close() Method

Last Updated : 28 Apr, 2025
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The zlib.close() method is an inbuilt application programming interface of the Zlib module which is used to close the underlying handle. Syntax: 
zlib.close( callback )
Parameters: This method accepts single parameter callback which holds the callback function. Below examples illustrate the use of zlib.close() method in Node.js: Example 1: javascript 
// Node.js program to demonstrate the     
// zlib.close() method

// Including zlib module
const zlib = require('zlib');

// Constructing createGzip and createGunzip
const input = zlib.createGzip();
const output = zlib.createGunzip();

// Piping
input.pipe(output);

// Write to stream
input.write('GeeksforGeeks');

// Calling flush method
input.flush();

// Calling close method
input.close();

// Check output
output.on('data', (d) => {
    console.log('Input: Data flush received '
                + d.length + ' bytes');
});
console.log("Closed!");
Output: 
Closed!
Example 2:
javascript 
// Node.js program to demonstrate the     
// zlib.close() method

// Including zlib and fs module
const zlib = require("zlib");
const fs = require('fs');

// Creating readable Stream
const inp = fs.createReadStream('input.text');

// Creating writable stream
const out = fs.createWriteStream('input.txt.gz');

// Calling createDeflateRaw method
const defR = zlib.createDeflateRaw();

// Calling close method
defR.close();

// Piping
inp.pipe(defR).pipe(out);
console.log("Program Completed!");
Output: 
Program Completed!
Here, piping is not done as close method closes the hidden handle. Reference: https://nodejs.org/api/zlib.html#zlib_zlib_close_callback

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