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

Last Updated : 26 Jun, 2020
The stats.uid property is an inbuilt application programming interface of the fs.Stats class is used to get the numeric (number / bigint) identity of the user to which the file belongs to. Syntax: 
stats.uid;
Return Value: It returns a number or BigInt value which represents the identity of the user that owns the file. Below examples illustrate the use of stats.uid property in Node.js: Example 1: javascript 
// Node.js program to demonstrate the   
// stats.uid property

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

// Calling fs.Stats stats.uid
//for directory using stat
fs.stat('./', (err, stats) => {
  if (err) throw err;
  console.log("using stat: numeric "
    + "identity of the user is "
    + stats.uid);
});
 
//using lstat
fs.lstat('./', (err, stats) => {
  if (err) throw err;
  console.log("using lstat: numeric "
    + "identity of the user is "
    + stats.uid);
});
 
// For file
// Using stat
fs.stat('./filename.txt', (err, stats) => {
  if (err) throw err;
  console.log("using stat: numeric "
    + "identity of the user is "
    + stats.uid);
});
 
// Using lstat
fs.lstat('./filename.txt', (err, stats) => {
  if (err) throw err;
  console.log("using lstat: numeric identity"
    + " of the user is  "+stats.uid);
});
Output: 
using stat: numeric identity of the user is  9932440
using lstat: numeric identity of the user is  9932440
using stat: numeric identity of the user is  9932440
using lstat: numeric identity of the user is  9932440
Example 2: javascript 
// Node.js program to demonstrate the   
// stats.uid property

// Accessing fs module
const fs = require('fs').promises;
 
// Calling fs.Stats stats.uid
(async() => {
    const stats = await fs.stat('./filename.txt');
  console.log("using stat synchronous: numeric "
    + "identity of the user is  "+stats.uid);
})().catch(console.error)
Output: 
(node:14456) ExperimentalWarning: The fs.promises API 
is experimental 
using stat synchronous: numeric identity of the user is 9932440
Note: The above program will compile and run by using the node filename.js command and use the file_path correctly. This API will work correctly for POSIX system. In other systems like WINDOWS it will return 0. Reference: https://nodejs.org/api/fs.html#fs_stats_uid
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