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Node.js fs.Dir.readSync() Method

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  • Last Updated : 19 Jan, 2022

The fs.Dir.readSync() method is an inbuilt application programming interface of class fs.Dir within File System module which is used to read the each next dirent of directory.
Syntax: 
 

const dir.readSync()

Parameter: This method does not accept any parameter.
Return Value: This method returns the dirent of the directory.
Below programs illustrates the use of fs.Dir.readSync() method in Node.js:
Example 1: 
Filename: index.js 
 

javascript




// Node.js program to demonstrate the
// dir.readSync() method
const fs = require('fs');
 
// Initiating async function
async function stop(path) {
 
  // Creating and initiating directory's
  // underlying resource handle
  const dir = await fs.promises.opendir(path);
   
  // Synchronously reading the directory's
  // underlying resource handle
  const dirent = dir.readSync();
 
  // Display the result
  console.log(dirent.name);
}
 
// Catching error
stop('./').catch(console.error);

Run index.js file using the following command: 

node index.js

Output: 

abcd.cer

Example 2: 
Filename: index.js 
 

javascript




// Node.js program to demonstrate the
// dir.readSync() method
const fs = require('fs');
   
// Initiating async function
async function stop(path) {
  
  let dir = null;
  
  try {
 
  // Creating and initiating directory's
  // underlying resource handle
  dir = await fs.promises.opendir(
      new URL('file:///F:/java/'));
 
  // Synchronously reading the directory's
  // underlying resource handle
  // using readSync() method
  for(var i = 0 ; i <= 3 ; i ++ ) {
    var dirent = dir.readSync();
 
    // Display the result
    console.log(dirent.name);
  }
 
  } finally {
  
    if (dir) {
 
      // Display the result
      console.log("dir is closed successfully");
 
      // Synchronously closeSyncing the
      // directory's underlying resource
      // handle
      const promise = dir.closeSync()
    }
  }
}
   
// Catching error
stop('./').catch(console.error);

Run index.js file using the following command: 

node index.js

Output: 

abcd.cer
cert.cer
certfile.cer
certificate1.cer
dir is closed successfully

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_dir_readsync
 


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