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Path

The node:path module provides utilities for working with file and directory paths.

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Import

import path from 'node:path';
// or
const path = require('node:path');

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Platform Differences

The default operation varies based on the operating system:
  • Windows: Uses backslashes (\) as path separators
  • POSIX (Linux, macOS): Uses forward slashes (/)

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Cross-Platform Consistency

// Use path.posix for consistent POSIX behavior
import { posix } from 'node:path';
posix.basename('/tmp/myfile.html'); // 'myfile.html' on all platforms

// Use path.win32 for consistent Windows behavior
import { win32 } from 'node:path';
win32.basename('C:\\temp\\myfile.html'); // 'myfile.html' on all platforms

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Core Methods

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path.basename(path[, suffix])

Returns the last portion of a path, similar to Unix basename command. Parameters:
  • path - The file path
  • suffix - Optional suffix to remove
Returns: 
import path from 'node:path';

path.basename('/foo/bar/baz/asdf/quux.html');
// Returns: 'quux.html'

path.basename('/foo/bar/baz/asdf/quux.html', '.html');
// Returns: 'quux'

// Windows
path.win32.basename('C:\\temp\\myfile.html');
// Returns: 'myfile.html'

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path.dirname(path)

Returns the directory name of a path, similar to Unix dirname command. Parameters:
  • path - The file path
Returns: 
path.dirname('/foo/bar/baz/asdf/quux');
// Returns: '/foo/bar/baz/asdf'

path.dirname('/foo/bar/baz/asdf/');
// Returns: '/foo/bar/baz'

// Windows
path.win32.dirname('C:\\temp\\myfile.html');
// Returns: 'C:\\temp'

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path.extname(path)

Returns the file extension from the last occurrence of . to the end of the string. Parameters:
  • path - The file path
Returns: 
path.extname('index.html');
// Returns: '.html'

path.extname('index.coffee.md');
// Returns: '.md'

path.extname('index.');
// Returns: '.'

path.extname('index');
// Returns: ''

path.extname('.index');
// Returns: ''

path.extname('.index.md');
// Returns: '.md'

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path.join([...paths])

Joins path segments together using the platform-specific separator, then normalizes the result. Parameters:
  • ...paths - Path segments to join
Returns: 
path.join('/foo', 'bar', 'baz/asdf', 'quux', '..');
// Returns: '/foo/bar/baz/asdf'

path.join('foo', {}, 'bar');
// Throws: TypeError: Path must be a string

// Windows
path.win32.join('C:\\temp', 'foo', 'bar');
// Returns: 'C:\\temp\\foo\\bar'

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path.normalize(path)

Normalizes the given path, resolving '..' and '.' segments. Parameters:
  • path - The path to normalize
Returns: 
path.normalize('/foo/bar//baz/asdf/quux/..');
// Returns: '/foo/bar/baz/asdf'

// Windows
path.win32.normalize('C:\\temp\\\\foo\\bar\\..\\')
// Returns: 'C:\\temp\\foo\\'

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path.parse(path)

Returns an object with properties representing the path components. Parameters:
  • path - The path to parse
Returns: with properties:
  • root - Root of the path
  • dir - Directory path
  • base - File name including extension
  • name - File name without extension
  • ext - File extension
path.parse('/home/user/dir/file.txt');
// Returns:
// {
//   root: '/',
//   dir: '/home/user/dir',
//   base: 'file.txt',
//   ext: '.txt',
//   name: 'file'
// }

// Windows
path.win32.parse('C:\\path\\dir\\file.txt');
// Returns:
// {
//   root: 'C:\\',
//   dir: 'C:\\path\\dir',
//   base: 'file.txt',
//   ext: '.txt',
//   name: 'file'
// }

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path.format(pathObject)

Returns a path string from an object (opposite of path.parse()). Parameters:
  • pathObject
    • dir
    • root
    • base
    • name
    • ext
Returns: 
path.format({
  root: '/',
  dir: '/home/user/dir',
  base: 'file.txt'
});
// Returns: '/home/user/dir/file.txt'

path.format({
  root: '/',
  name: 'file',
  ext: '.txt'
});
// Returns: '/file.txt'

// Windows
path.win32.format({
  dir: 'C:\\path\\dir',
  base: 'file.txt'
});
// Returns: 'C:\\path\\dir\\file.txt'

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path.isAbsolute(path)

Determines if the path is an absolute path. Parameters:
  • path - The path to check
Returns: 
// POSIX
path.isAbsolute('/foo/bar');   // true
path.isAbsolute('/baz/..');    // true
path.isAbsolute('qux/');       // false
path.isAbsolute('.');          // false

// Windows
path.win32.isAbsolute('//server');    // true
path.win32.isAbsolute('\\\\server');  // true
path.win32.isAbsolute('C:/foo/..');   // true
path.win32.isAbsolute('bar\\baz');    // false
path.win32.isAbsolute('.');           // false

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path.relative(from, to)

Returns the relative path from from to to based on the current working directory. Parameters:
  • from - Source path
  • to - Destination path
Returns: 
path.relative('/data/orandea/test/aaa', '/data/orandea/impl/bbb');
// Returns: '../../impl/bbb'

// Windows
path.win32.relative('C:\\orandea\\test\\aaa', 'C:\\orandea\\impl\\bbb');
// Returns: '..\\..\\impl\\bbb'

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path.resolve([...paths])

Resolves a sequence of paths or path segments into an absolute path. Parameters:
  • ...paths - Sequence of paths to resolve
Returns: 
path.resolve('/foo/bar', './baz');
// Returns: '/foo/bar/baz'

path.resolve('/foo/bar', '/tmp/file/');
// Returns: '/tmp/file'

path.resolve('wwwroot', 'static_files/png/', '../gif/image.gif');
// If current directory is /home/myself/node:
// Returns: '/home/myself/node/wwwroot/static_files/gif/image.gif'

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path.matchesGlob(path, pattern)

Determines if a path matches a glob pattern. Parameters:
  • path - The path to test
  • pattern - The glob pattern
Returns: 
path.matchesGlob('/foo/bar', '/foo/*');      // true
path.matchesGlob('/foo/bar*', 'foo/bird');   // false

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path.toNamespacedPath(path) (Windows only)

Returns an equivalent namespace-prefixed path (Windows only). Parameters:
  • path - The path to convert
Returns: 
// Windows only
path.win32.toNamespacedPath('C:\\temp\\file.txt');
// Returns: '\\\\?\\C:\\temp\\file.txt'

// POSIX - returns path unchanged
path.posix.toNamespacedPath('/tmp/file.txt');
// Returns: '/tmp/file.txt'

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Properties

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path.sep

Provides the platform-specific path segment separator.
  • \\ on Windows
  • / on POSIX
// POSIX
'foo/bar/baz'.split(path.sep);
// Returns: ['foo', 'bar', 'baz']

// Windows
'foo\\bar\\baz'.split(path.sep);
// Returns: ['foo', 'bar', 'baz']

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path.delimiter

Provides the platform-specific path delimiter.
  • ; on Windows
  • : on POSIX
// POSIX
console.log(process.env.PATH);
// Prints: '/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin'

process.env.PATH.split(path.delimiter);
// Returns: ['/usr/bin', '/bin', '/usr/sbin', '/sbin', '/usr/local/bin']

// Windows
console.log(process.env.PATH);
// Prints: 'C:\\Windows\\system32;C:\\Windows;C:\\Program Files\\node\\'

process.env.PATH.split(path.delimiter);
// Returns: ['C:\\Windows\\system32', 'C:\\Windows', 'C:\\Program Files\\node\\']

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path.posix

Provides access to POSIX-specific implementations of path methods. 
import { posix } from 'node:path';

// Use POSIX methods regardless of platform
posix.basename('/tmp/myfile.html');
// Returns: 'myfile.html'

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path.win32

Provides access to Windows-specific implementations of path methods. 
import { win32 } from 'node:path';

// Use Windows methods regardless of platform
win32.basename('C:\\temp\\myfile.html');
// Returns: 'myfile.html'

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Common Patterns

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Building File Paths

import path from 'node:path';
import { fileURLToPath } from 'node:url';

// ES modules
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const configPath = path.join(__dirname, 'config', 'database.json');

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Path Manipulation

const filePath = '/home/user/docs/file.txt';

// Get components
const dir = path.dirname(filePath);      // '/home/user/docs'
const file = path.basename(filePath);    // 'file.txt'
const ext = path.extname(filePath);      // '.txt'
const name = path.basename(filePath, ext); // 'file'

// Build new path
const newPath = path.join(dir, name + '.md');
// Returns: '/home/user/docs/file.md'

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Resolving Relative Paths

// Resolve relative to current directory
const absolutePath = path.resolve('data', 'users.json');

// Resolve relative to specific directory
const dataDir = '/var/app/data';
const usersPath = path.resolve(dataDir, 'users.json');
// Returns: '/var/app/data/users.json'

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Cross-Platform Path Handling

// Always use path.join() instead of string concatenation
// Good:
const goodPath = path.join('users', userId, 'profile.json');

// Bad (will fail on Windows):
const badPath = 'users/' + userId + '/profile.json';

// Convert to platform-specific separators
const normalizedPath = path.normalize(somePath);

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Best Practices

  1. Always use path.join() for combining paths (cross-platform)
  2. Use path.resolve() to get absolute paths
  3. Avoid string concatenation for paths
  4. Use path.sep for platform-specific separators
  5. Use path.normalize() to clean up paths
  6. Test on both Windows and POSIX if building cross-platform apps

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Common Pitfalls

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Windows Path Separators

// Wrong - hardcoded separator
const badPath = 'C:/Users' + '/Documents'; // May not work on Windows

// Correct - use path.join
const goodPath = path.join('C:', 'Users', 'Documents');

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Relative Path Resolution

// path.join() doesn't resolve to absolute
path.join('.', 'file.txt'); // './file.txt' (relative)

// path.resolve() resolves to absolute
path.resolve('.', 'file.txt'); // '/current/working/dir/file.txt'

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See Also