Node.js zlib.deflateSync() Method

The zlib.deflateSync() method is an inbuilt application programming interface of the Zlib module which is used to compress a chunk of data with Deflate. 

Syntax:

zlib.deflateSync( buffer, options )

Parameters: This method accepts two parameters as mentioned above and described below:

• buffer: This parameter holds the buffer of type Buffer, TypedArray, DataView, ArrayBuffer, and string.
• options: This parameter holds the value of the zlib option.

Return Value: It returns the chunk of data with deflate. 

The below examples illustrate the use of zlib.deflateSync() method in Node.js: 

Example 1:

javascript

// Node.js program to demonstrate the
// zlib.deflateSync() method

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

// Declaring input and assigning
// it a value string
const input = "GfG CS-Portal";

// Calling deflateSync method
const deflated = zlib.deflateSync(input);

console.log(deflated);

Output:

<Buffer 78 9c 73 4f 73 57 70 0e d6 0d c8 2f 2a 49 cc 01 00 1b 48 04 4a>

Example 2:

javascript

// Node.js program to demonstrate the
// zlib.deflateSync() method

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

// Declaring input and assigning
// it a value string
const input = "GfG CS-Portal";

// Calling deflateSync method and converting
// the deflate to string encoded with hex
const deflated = zlib.deflateSync(input).toString('hex');

console.log(deflated);

Output:

789c734f7357700ed60dc82f2a49cc01001b48044a

Reference: https://nodejs.org/api/zlib.html#zlib_zlib_deflatesync_buffer_options