Node.js fs.chmodSync() Method Last Updated : 28 Apr, 2025 Comments Improve Suggest changes Like Article Like Report The fs.chmodSync() method is used to synchronously change the permissions of a given path. These permissions can be specified using string constants or octal numbers that correspond to their respective file modes.Note: The Windows platform only supports the changing of the write permission. It also does not support the distinction between the permissions of user, group or others.Syntax: fs.chmodSync( path, mode ) Parameters: This method accepts two parameters as mentioned above and described below: path: It is a string, Buffer or URL that denotes the path of the file of which the permission has to be changed.mode: It is string or octal integer constant that denotes the permission to be granted. The logical OR operator can be used to separate multiple permissions. Below examples illustrate the fs.chmodSync() method in Node.js:Example 1: This example shows the usage of string constants and OR operator to give the file permissions. javascript // Node.js program to demonstrate the // fs.chmodSync 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); // Check the file mode console.log("Current File Mode:", fs.statSync("example.txt").mode); // Reading the file console.log("File Contents:", fs.readFileSync("example.txt", 'utf8')); // Trying to write to file try { console.log("Trying to write to file"); fs.writeFileSync('example.txt', "Hello"); } catch (e) { console.log("Error Found, Code:", e.code); } // Allowing both read and write permission console.log("\nGiving both read and write" + " permissions to user"); fs.chmodSync("example.txt", fs.constants.S_IRUSR | fs.constants.S_IWUSR); // Check the file mode console.log("Current File Mode:", fs.statSync("example.txt").mode); console.log("Trying to write to file"); fs.writeFileSync('example.txt', "World"); console.log("File Contents:", fs.readFileSync("example.txt", 'utf8')); Output: Giving only read permission to user Current File Mode: 33024 File Contents: Hello Trying to write to file Error Found, Code: EACCES Giving both read and write permissions to user Current File Mode: 33152 Trying to write to file File Contents: World Example 2: This example shows the usage of octal integer constants to give the file permissions. javascript // Node.js program to demonstrate the // fs.chmodSync method // Import the filesystem module const fs = require('fs'); // Allowing only read permission console.log("Giving only read permission to everyone"); fs.chmodSync("example.txt", 0o444); // Check the file mode console.log("Current File Mode:", fs.statSync("example.txt").mode); // Reading the file console.log("File Contents:", fs.readFileSync("example.txt", 'utf8')); // Trying to write to file try { console.log("Trying to write to file"); fs.writeFileSync('example.txt', "Hello"); } catch (e) { console.log("Error Found, Code:", e.code); } // Allowing both read and write permission console.log("\nGiving both read and " + "write permission to everyone"); fs.chmodSync("example.txt", 0o666); // Check the file mode console.log("Current File Mode:", fs.statSync("example.txt").mode); console.log("Trying to write to file"); fs.writeFileSync('example.txt', "World"); console.log("File Contents:", fs.readFileSync("example.txt", 'utf8')); Output: Giving only read permission to everyone Current File Mode: 33060 File Contents: Hello Trying to write to file Error Found, Code: EACCES Giving both read and write permission to everyone Current File Mode: 33206 Trying to write to file File Contents: World Reference: https://nodejs.org/api/fs.html#fs_fs_chmodsync_path_mode Comment More infoAdvertise with us S sayantanm19 Follow Improve Article Tags : 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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