What is ZLIB in Node.js?

• zlib is a software library used for data compression.
• The Node.js Zlib module is used to provide compression and decompression (zip and unzip) functionalities.
• It is implemented using Gzip and deflate/inflate.
• The zlib module can be accessed using

const zlib = require('zlib');  

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• Compressing and decompressing a file can be done by piping the source stream data into a destination stream through zlib stream.

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Node.js ZLIB Example: Compress File

• Let's see a simple example of Node.js ZLIB module to compress a file "input.txt" into "input.txt.gz".
• Node JS Tutorial File: zlib_example1.js

zlib_example1.js

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

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• We have a text file named "input.txt" on the desktop.

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• Open Node.js command prompt and run the following code:
• node zlib_example1.js

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• You can see that it will produce a compressed file named "input.txt.gz" on the desktop.

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Node.js ZLIB Example: Decompress File

• Let's see a simple example of Node.js ZLIB module to decompress a file "input.txt.gz" into "input2.txt".
• Node JS Tutorial File: zlib_example2.js

zlib_example2.js

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

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• Now you will see that same code of "input.txt" is available into "input2.txt" file.

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