Node.js ZLIB

Node.js Zlib Module

The Node.js Zlib module is a built-in utility that enables compression and decompression (zip and unzip). Implemented using Gzip and Deflate/Inflate algorithms, it lets developers reduce file sizes and manage data transfer efficiently.

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Import the Zlib module with:

const zlib = require('zlib');

Example: Compress a File

// zlib_example1.js
const zlib = require('zlib');
const fs = require('fs');
const gzip = zlib.createGzip();
const inp = fs.createReadStream('input.txt');
const out = fs.createWriteStream('input.txt.gz');
inp.pipe(gzip).pipe(out);

// Run: node zlib_example1.js

This creates a compressed file input.txt.gz by piping the read stream through Gzip into a write stream.

Example: Decompress a File

// zlib_example2.js
const zlib = require('zlib');
const fs = require('fs');
const unzip = zlib.createUnzip();
const inp = fs.createReadStream('input.txt.gz');
const out = fs.createWriteStream('input2.txt');
inp.pipe(unzip).pipe(out);

// Run: node zlib_example2.js

Synchronous Compression Methods

For small in-memory data, Zlib also offers synchronous helpers:

const zlib = require('zlib');
const compressed = zlib.gzipSync('Hello UpdateGadh');
const original = zlib.gunzipSync(compressed).toString();
console.log(original); // Hello UpdateGadh

Compression is highly effective ÔÇö a 40 KB text file may compress to around 1 KB and decompress back perfectly.

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Conclusion

The Zlib module makes compression and decompression simple in Node.js, whether through streams or synchronous helpers. It is invaluable for reducing storage and speeding up data transfer. For more Node.js tutorials, stay tuned to .

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