Node.js fs.accessSync() Method Last Updated : 08 Oct, 2021 Comments Improve Suggest changes Like Article Like Report The fs.accessSync() method is used to synchronously test the permissions of a given file or directory. The permissions to be checked can be specified as a parameter using file access constants. It is also possible to check multiple file permissions by using the bitwise OR operator to create a mask with more than one file constant. Syntax: fs.accessSync( path, mode ) Parameters: This method accepts two parameters as mentioned above and described below: path: It is a String, Buffer or URL which denotes the path of the file or directory for which the permission has to be tested. mode: It is an integer value that denotes the permission to be tested for. The logical OR operator can be used to separate multiple permission. It can have the values fs.constants.F_OK, fs.constants.R_OK, fs.constants.W_OK and fs.constants.X_OK. It is an optional parameter. The default value is fs.constants.F_OK. Below examples illustrate the fs.accessSync() method in Node.js: Example 1: This example shows the testing of the read and write permission of a file. javascript // Node.js program to demonstrate the // fs.accessSync() method // Import the filesystem module const fs = require('fs'); // Allowing only read permission console.log("Giving only read permission to user"); fs.chmodSync("example.txt", fs.constants.S_IRUSR); // Test the read permission console.log('\n> Checking Permission for reading the file'); try { fs.accessSync('example.txt', fs.constants.R_OK); console.log('File can be read'); } catch (err) { console.error('No Read access'); } // Test both the read and write permission console.log('\n> Checking Permission for reading and writing to file'); try { fs.accessSync('example.txt', fs.constants.R_OK | fs.constants.W_OK); console.log('File can be read and written'); } catch (err) { console.error('No Read and Write access'); } Output: Giving only read permission to user > Checking Permission for reading the file File can be read > Checking Permission for reading and writing to file No Read and Write access Example 2: This example shows the testing of a file if it exists. javascript // Node.js program to demonstrate the // fs.accessSync() method // Import the filesystem module const fs = require('fs'); // Test the if the file exists console.log('\n> Checking if the file exists'); try { fs.accessSync('example.txt', fs.constants.F_OK); console.log('File does exist'); } catch (err) { console.error('File does not exist'); } console.log('\nCreating the file'); fs.writeFileSync("example.txt", "Test File"); // Test the if the file exists again console.log('\n> Checking if the file exists'); try { fs.accessSync('example.txt', fs.constants.F_OK); console.log('File does exist'); } catch (err) { console.error('File does not exist'); } Output: > Checking if the file exists File does not exist Creating the file > Checking if the file exists File does exist Reference: https://nodejs.org/api/fs.html#fs_fs_accesssync_path_mode Comment More infoAdvertise with us S sayantanm19 Follow Improve Article Tags : JavaScript Web Technologies Node.js Node.js-fs-module Similar Reads Node JS fs.readFile() Method ​In Node.js, the fs.readFile() method is a fundamental tool for reading files asynchronously, allowing your application to remain responsive while accessing file data. 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