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Node.js | zlib.brotliDecompress() Method

  • Last Updated : 05 Mar, 2020

The zlib.brotliDecompress() method is an inbuilt application programming interface of the Zlib module which is used to decompresses a chunk of data with BrotliCompress.

Syntax:

zlib.brotliDecompress( 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.

Below examples illustrate the use of zlib.brotliDecompress() method in Node.js:



Example 1:




// Node.js program to demonstrate the     
// brotliDecompress() method
  
// Including zlib module
const zlib = require("zlib");
  
// Declaring input and assigning
// it a value string
var input = "Computer Science";
  
// Calling brotliCompress method
zlib.brotliCompress(input, (err, buffer) => {
  
    // Calling brotliDecompress
    zlib.brotliDecompress(buffer, (err, buffer) => {
        console.log(buffer.toString('base64'));
    });
});

Output:

Q29tcHV0ZXIgU2NpZW5jZQ==

Example 2:




// Node.js program to demonstrate the     
// brotliDecompress() method
  
// Including zlib module
const zlib = require("zlib");
  
// Declaring input and assigning
// it a value string
var input = "Computer Science";
  
// Calling brotliCompress method
zlib.brotliCompress(input, (err, buffer) => {
  
    // Calling brotliDecompress
    zlib.brotliDecompress(buffer, (err, buffer) => {
        console.log(buffer.toString('bas64'));
    });
});

Output:

buffer.js:631  throw new ERR_UNKNOWN_ENCODING(encoding);  ^

TypeError [ERR_UNKNOWN_ENCODING]: Unknown encoding: bas64
    at stringSlice (buffer.js:631:9)    at Buffer.toString (buffer.js:667:10)
    at BrotliDecompress.zlib.brotliDecompress [as cb] 
    (/home/runner/BeautifulMiserlySourcecode/index.js:18:28)
    at BrotliDecompress.zlibBufferOnEnd (zlib.js:133:10)
    at BrotliDecompress.emit (events.js:203:15)
    at BrotliDecompress.EventEmitter.emit (domain.js:448:20)
    at endReadableNT (_stream_readable.js:1143:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)?

Here, an error occurs while encoding so, an error is thrown.

Reference: https://nodejs.org/api/zlib.html#zlib_zlib_brotlidecompress_buffer_options_callback




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