Node.js zlib.createGzip() Method
The zlib.createGzip() method is an inbuilt application programming interface of the Zlib module which is used to create a new Gzip object.
Syntax:
zlib.createGzip( options )
Parameters: This method accepts single parameter options which is optional parameter that holds the zlib options.
Return Value: It returns a new Gzip object.
Below examples illustrate the use of zlib.createGzip() method in Node.js:
Example 1:
// Node.js program to demonstrate the // createGzip() method // Including zlib and fs module const zlib = require( "zlib" ); const fs = require( 'fs' ); // Creating readable Stream const inp = fs.createReadStream( 'input.txt' ); // Creating writable stream const out = fs.createWriteStream( 'input.txt.gz' ); // Calling createGzip method const gzip = zlib.createGzip(); // Piping inp.pipe(gzip).pipe(out); console.log( "Gzip created!" ); |
Output:
Gzip created!
Example 2:
// Node.js program to demonstrate the // createGzip() method // Including zlib and fs module const zlib = require( "zlib" ); const fs = require( 'fs' ); // Creating readable Stream const inp = fs.createReadStream( 'input.txt' ); // Creating writable stream const out = fs.createWriteStream( 'input.txt.gz' ); // Calling createGzip method const gzip = zlib.createGzip(); // Piping inp.pipe(out).pipe(gzip); console.log( "Gzip created!" ); |
Output:
Error [ERR_STREAM_CANNOT_PIPE]: Cannot pipe, not readable at WriteStream.Writable.pipe (_stream_writable.js:243:24) at /home/runner/SomberMonumentalCad/index.js:19:15 at Script.runInContext (vm.js:133:20) at Object. (/run_dir/interp.js:156:20) at Module._compile (internal/modules/cjs/loader.js:778:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10) at Module.load (internal/modules/cjs/loader.js:653:32) at tryModuleLoad (internal/modules/cjs/loader.js:593:12) at Function.Module._load (internal/modules/cjs/loader.js:585:3)
Here, piping is not done in a proper order so, error is thrown.
Reference: https://nodejs.org/api/zlib.html#zlib_zlib_creategzip_options
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