node.js: fs.mkdir(path[, mode], callback): Create a directory asynchronously

fs.mkdir(path[, mode], callback)

This function creates a directory asynchronously. Callback function will be called on error cases.

Below table summarizes the arguments of mkdir function.

Argument	Type	Description
path	string or Buffer or URL	Specify the directory name to create
mode	integer	Default value is 0o777, it is not supported in Windows Operating System.
callback	Function	This function takes one argument ‘err’ and it is called when mkdir call is executed. On failure cases ‘err’ represents the stack trace.

Below table summarizes the modes supported by node.js

Constant (mode)	Octal value	Description
fs.constants.S_IRUSR	0o400	read by owner
fs.constants.S_IWUSR	0o200	write by owner
fs.constants.S_IXUSR	0o100	execute/search by owner
fs.constants.S_IRGRP	0o40	read by group
fs.constants.S_IWGRP	0o20	write by group
fs.constants.S_IXGRP	0o10	execute/search by group
fs.constants.S_IROTH	0o4	read by others
fs.constants.S_IWOTH	0o2	write by others
fs.constants.S_IXOTH	0o1	execute/search by others

Find the below working application.

HelloWorld.js

var fs = require('fs');

var folderToCreate = 'testDir';

if (fs.existsSync(folderToCreate)) {
    console.log(`File ${folderToCreate} is already exists`);
} else {
    console.log(`File ${folderToCreate} is not exists, trying to create the directory`);
    fs.mkdir(folderToCreate, (error) => {
        if (error) {
            console.log(`Failed to create the directory ${folderToCreate}`);
        } else {
            console.log(`Directory ${folderToCreate} created successfully`);
        }

    });
}

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