Node.js stats.blksize Property from fs.Stats Class

The stats.blksize property is an inbuilt application programming interface of the fs.Stats class is used to get the block size for I/O operations in the file system in bytes.

Syntax:

stats.blksize;

Return Value: It returns a number or BigInt value which represents the block size for I/O operations in the file system in bytes.

Below examples illustrate the use of stats.blksize in Node.js:

Example 1:

// Node.js program to demonstrate the
// stats.blksize property

// Accessing fs module
const fs = require('fs');

// Calling fs.Stats stats.blksize
// using stat
fs.stat('./', (err, stats) => {
  if (err) throw err;
  console.log("using stat: the block "
    + "size for I/O operations in the"
    + " file system in bytes is "
    + stats.blksize);
});

// Using lstat
fs.lstat('./', (err, stats) => {
  if (err) throw err;
  console.log("using lstat: the block "
    + "size for I/O operations in the "
    + "file system in bytes is "
    + stats.blksize);
});

Output:

using stat: the block size for I/O operations 
in the file in bytes is  4096
using lstat: the block size for I/O operations 
in the file in bytes is  4096

Example 2:

// Node.js program to demonstrate the
// stats.blksize property

// Accessing fs module
const fs = require('fs').promises;

// Calling fs.Stats stats.blksize
(async () => {
    const stats = await fs.stat('./');
    console.log("using stat synchronous: "
        + "the block size for I/O operations"
        + " in the file system in bytes is "
        + stats.blksize);
})().catch(console.error)

Output:

(node:6376) ExperimentalWarning: The fs.promises
API is experimental
using stat synchronous: the block size for I/O 
operations in the file system in bytes is  4096

Note: The above program will compile and run by using the node filename.js command and use the file_path correctly.

Reference: https://nodejs.org/api/fs.html#fs_stats_blksize