Node.js fs.accessSync() Method
Last Updated :
08 Oct, 2021
Improve
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:
javascript
Output:
javascript
Output:
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_OKandfs.constants.X_OK. It is an optional parameter. The default value isfs.constants.F_OK.
// 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');
}
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 accessExample 2: This example shows the testing of a file if it exists.
// 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');
}
> Checking if the file exists File does not exist Creating the file > Checking if the file exists File does existReference: https://nodejs.org/api/fs.html#fs_fs_accesssync_path_mode
