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Node.js | fs.existsSync() Method
  • Last Updated : 20 Feb, 2020

The fs.existsSync() method is used to synchronously check if a file already exists in the given path or not. It returns a boolean value which indicates the presence of a file.

Syntax:

fs.existsSync( path )

Parameters: This method accepts a single parameter as mentioned above and described below:

  • path: It holds the path of the file that has to be checked. It can be a String, Buffer or URL.

Return Value: It returns a boolean value i.e true if the file exists otherwise returns false.

Below programs illustrate the fs.existsSync() method in Node.js:



Example 1:




// Node.js program to demonstrate the
// fs.existsSync() method
  
// Import the filesystem module
const fs = require('fs');
  
// Get the current filenames
// in the directory
getCurrentFilenames();
  
let fileExists = fs.existsSync('hello.txt');
console.log("hello.txt exists:", fileExists);
  
fileExists = fs.existsSync('world.txt');
console.log("world.txt exists:", fileExists);
  
// Function to get current filenames
// in directory
function getCurrentFilenames() {
  console.log("\nCurrent filenames:");
  fs.readdirSync(__dirname).forEach(file => {
    console.log(file);
  });
  console.log("\n");
}

Output:

Current filenames:
hello.txt
index.js
package.json


hello.txt exists: true
world.txt exists: false

Example 2:




// Node.js program to demonstrate the
// fs.existsSync() method
  
// Import the filesystem module
const fs = require('fs');
  
// Get the current filenames
// in the directory
getCurrentFilenames();
  
// Check if the file exists
let fileExists = fs.existsSync('hello.txt');
console.log("hello.txt exists:", fileExists);
  
// If the file does not exist
// create it
if (!fileExists) {
  console.log("Creating the file")
  fs.writeFileSync("hello.txt", "Hello World");
}
  
// Get the current filenames
// in the directory
getCurrentFilenames();
  
// Check if the file exists again
fileExists = fs.existsSync('hello.txt');
console.log("hello.txt exists:", fileExists);
  
// Function to get current filenames
// in directory
function getCurrentFilenames() {
  console.log("\nCurrent filenames:");
  fs.readdirSync(__dirname).forEach(file => {
    console.log(file);
  });
  console.log("\n");
}

Output:

Current filenames:
hello.txt
index.js
package.json


hello.txt exists: true

Current filenames:
hello.txt
index.js
package.json


hello.txt exists: true

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

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