Node.js zlib.gzip() Method Last Updated : 28 Apr, 2025 Comments Improve Suggest changes Like Article Like Report The zlib.gzip() method is an inbuilt application programming interface of the Zlib module which is used to compress a chunk of data. Syntax: zlib.gzip( buffer, options, callback ) Parameters: This method accepts three parameters as mentioned above and described below: buffer: It can be of type Buffer, TypedArray, DataView, ArrayBuffer, and string.options: It is an optional parameter that holds the zlib options.callback: It holds the callback function. Return Value: It returns the chunk of data after compression. The below examples illustrate the use of zlib.gzip() method in Node.js: Example 1: javascript // Node.js program to demonstrate the // gzip() method // Including zlib module const zlib = require("zlib"); // Declaring input and assigning // it a value string const input = "Geek"; // Calling gzip method zlib.gzip(input, (err, buffer) => { if (!err) { console.log(buffer.toString('base64')); } else { console.log(err); } }); console.log("Data Compressed..."); Output: Data Compressed... H4sIAAAAAAAAA3NPTc0GAGGRcasEAAAA Example 2: javascript // Node.js program to demonstrate the // gzip() method // Including zlib module const zlib = require("zlib"); // Declaring input and assigning // it a value string const input = "Geek"; // Calling gzip method zlib.gzip(input, (err, buffer) => { if (!err) { console.log(buffer.toString('hex')); } else { console.log(err); } }); console.log("Data Compressed..."); Output: Hint: hit control+c anytime to enter REPL. Data Compressed... 1f8b0800000000000003734f4dcd0600619171ab04000000 Reference: https://nodejs.org/api/zlib.html#zlib_zlib_gzip_buffer_options_callback Comment More infoAdvertise with us N nidhi1352singh Follow Improve Article Tags : Web Technologies Node.js Node.js-Zlib-module Similar Reads Node.js zlib.constants Property The zlib.constants property is used to yields an object listing Zlib-related constants. Syntax: zlib.constants Return Value: It returns all the Zlib-related constants. Below examples illustrate the use of zlib.constants property in Node.js: Example 1: javascript // Node.js program to demonstrate // 4 min read Node.js zlib.createBrotliCompress() Method The zlib.createBrotliCompress() method is an inbuilt application programming interface of the Zlib module which is used to create BrotliCompress object. 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