Node.js stats.isBlockDevice() Method from fs.Stats Class

The stats.isBlockDevice() method is an inbuilt application programming interface of the fs.Stats class which is used to check whether fs.Stats object is of a block device or not.

Syntax:

stats.isBlockDevice();

Parameters: This method does not accept any parameter.

Return Value: This method returns a boolean value, i.e. true if fs.Stats object describes a block device, false otherwise.

Below examples illustrate the use of stats.isBlockDevice() method in Node.js:

Example 1:

// Node.js program to demonstrate the
// stats.isBlockDevice() method

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

// Calling fs.Stats isBlockDevice()
fs.stat('./filename.txt', (err, stats) => {
    if (err) throw err;

    // console.log(`stats: ${JSON.stringify(stats)}`);
    console.log(stats.isBlockDevice());
});

Output:

false

Example 2:

// Node.js program to demonstrate the
// stats.isBlockDevice() method

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

// Calling fs.Stats isBlockDevice() method
fs.stat('./filename.txt', (err, stats) => {
    if (err) throw err;

    // console.log(
    //  `stats: ${JSON.stringify(stats)}`);
    if (stats.isBlockDevice()) {
        console.log("fs.Stats describes a "
            + "block device");
    } else {
        console.log("fs.Stats does not "
            + "describe a block device");
    }
});

Output:

fs.Stats does not describe a block device

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_isblockdevice