The zlib.unzip() method is an inbuilt application programming interface of the Zlib module which is used to decompress a chunk of data.
Syntax:
zlib.unzip( 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 decompression.
The below examples illustrate the use of zlib.unzip() method in Node.js:
Example 1:
// Node.js program to demonstrate the
// unzip() method
// Including zlib module
const zlib = require("zlib");
// Declaring input and assigning
// it a value string
let input = "GfG";
// Calling gzip method
zlib.gzip(input, (err, buffer) => {
// Calling unzip method
zlib.unzip(buffer, (err, buffer) => {
console.log(buffer.toString('utf8'));
});
});
console.log("Data Decompressed...");
Output:
Data Decompressed... GfG
Example 2:
// Node.js program to demonstrate the
// unzip() method
// Including zlib module
const zlib = require("zlib");
// Declaring input and assigning
// it a value string
let input = "GfG";
// Calling gzip method
zlib.gzip(input, (err, buffer) => {
// Calling unzip method
zlib.unzip(buffer, (err, buffer) => {
console.log(buffer.toString('base64'));
});
});
console.log("Data Decompressed...");
Output:
Data Decompressed... R2ZH