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Node.js stats.dev Property

Last Updated : 08 Oct, 2021
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The stats.dev property is an inbuilt application programming interface of the fs.Stats class is used to get the numeric (number / bigint) identity of the device in which the file is situated. Syntax: 
stats.dev;
Parameters: This property does not accept any parameter. Return Value: It returns a number or BigInt value which represents the identity of the device in which the file is situated. Below examples illustrate the use of stats.dev property in Node.js: Example 1: javascript 
// Node.js program to demonstrate the   
// stats.dev Property

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

// Calling fs.Stats stats.dev
// using stat for file
fs.stat('./filename.txt', (err, stats) => {
    if (err) throw err;
    console.log("using stat: the numeric "
        + "identity of the device is  "
        + stats.dev);
});

//using lstat for file
fs.lstat('./filename.txt', (err, stats) => {
    if (err) throw err;
    console.log("using lstat: the numeric "
        + "identity of the device is  "
        + stats.dev);
});
//using stat for directory
fs.stat('./', (err, stats) => {
    if (err) throw err;
    console.log("using stat: the numeric "
        + "identity of the device is  " 
        + stats.dev);
});

//using lstat for directory
fs.lstat('./', (err, stats) => {
    if (err) throw err;
    console.log("using lstat: the numeric "
        + "identity of the device is  " 
        + stats.dev);
});
Output: 
using stat: the numeric identity of the device is  891323748
using lstat: the numeric identity of the device is  891323748
using stat: the numeric identity of the device is  891323748
using lstat: the numeric identity of the device is  891323748
Example 2: javascript 
// Node.js program to demonstrate the   
// stats.dev Property

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

// Calling stats.dev property from
// fs.Stats class
(async () => {
    const stats = await fs.stat(
            './fs_stat_dev.txt');

    //using stat synchronous
    console.log("The numeric identity "
        + "of the device is  " + stats.dev);
})().catch(console.error)
Output: 
The numeric identity of the device is  891323748
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_dev

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