Node.js zlib.flush() Method Last Updated : 28 Jul, 2023 Suggest changes Share Like Article Like Report The flush() method is called on a compression stream so that it can compel zlib to return as much output as achievable at present. This output may be returned at the cost of corrupt compression quality but it can be useful when data is required to be accessible as early as possible. Syntax: zlib.flush() Parameters: This method does not accept any parameters. Return Value: It returns the data as much as possible at present. Below examples illustrate the use of zlib.flush() method in Node.js: Example 1: javascript // Node.js program to demonstrate the // zlib.flush() 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(); // Check output output.on('data', (d) => { console.log('Input: Data flush received ' + d.length + ' bytes'); }); console.log("Program Complete!"); Output: Program Complete! Input: Data flush received 13 bytes Example 2: javascript // Node.js program to demonstrate the // zlib.flush() method // Including zlib module const zlib = require('zlib'); // Constructing createGzip and createGunzip const input = zlib.createGzip(); const output = zlib.createGunzip(); // Piping input.pipe(output); // Writing to a stream of data 19000 bytes input.write('G'.repeat(19000)); // Calling flush method with callback input.flush(() => {}); // Check output output.on('data', (d) => { console.log('Input: Data flush with callback received ' + d.length + ' bytes'); }); console.log("Program Complete!"); Output: So, after the byte size exceeds 16384 bytes then you need to callback flush method else data won't be flushed fully. Program Complete! Input: Data flush with callback received 16384 bytes Input: Data flush with callback received 2616 bytes Reference: https://nodejs.org/api/zlib.html#zlib_flushing N nidhi1352singh Follow Article Tags : Web Technologies Node.js Node.js-Zlib-module Explore Node.js Tutorial 3 min read Introduction & Installation NodeJS Introduction 3 min read Node.js Roadmap: A Complete Guide 6 min read How to Install Node.js on Linux 6 min read How to Install Node.js on Windows 5 min read How to Install NodeJS on MacOS 6 min read Node.js vs Browser - Top Differences That Every Developer Should Know 6 min read NodeJS REPL (READ, EVAL, PRINT, LOOP) 4 min read Explain V8 engine in Node.js 7 min read Node.js Web Application Architecture 3 min read NodeJS Event Loop 5 min read Node.js Modules , Buffer & StreamsNodeJS Modules 5 min read What are Buffers in Node.js ? 4 min read Node.js Streams 4 min read Node.js Asynchronous ProgrammingAsync Await in Node.js 3 min read Promises in NodeJS 7 min read How to Handle Errors in Node.js ? 4 min read Exception Handling in Node.js 3 min read Node.js NPMNodeJS NPM 6 min read Steps to Create and Publish NPM packages 7 min read Introduction to NPM scripts 2 min read Node.js package.json 4 min read What is package-lock.json ? 3 min read Node.js Deployments & CommunicationNode Debugging 2 min read How to Perform Testing in Node.js ? 2 min read Unit Testing of Node.js Application 5 min read NODE_ENV Variables and How to Use Them ? 2 min read Difference Between Development and Production in Node.js 3 min read Best Security Practices in Node.js 4 min read Deploying Node.js Applications 5 min read How to Build a Microservices Architecture with NodeJS 3 min read Node.js with WebAssembly 3 min read Resources & ToolsNode.js Web Server 6 min read Node Exercises, Practice Questions and Solutions 4 min read Node.js Projects 9 min read NodeJS Interview Questions and Answers 15+ min read My Profile ${profileImgHtml} My Profile Edit Profile My Courses Join Community Transactions Logout Like