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..." );
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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..." );
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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