Node.js path.join() Method

The path.join() method in Node.js Path module is used to join all given path segments together to form a single well formed path. While forming the path path.join() method takes care of the following.

1. Uses the platform-specific separator as a delimiter. For example / on POSIX and either \ or / on Windows.
2. Normalizes the resulting path. While normalizing following tasks are done.
   • Resolves '..' (parent directory or one level up) and '.' (current directory) segments.
   • When multiple, sequential path segment separation characters are found (e.g. / on POSIX and either \ or / on Windows), they are replaced by a single instance of the platform-specific path segment separator (/ on POSIX and \ on Windows).
   • If the path is a zero-length string, '.' is returned, representing the current working directory.

path.join() method syntax

path.join([...paths])

...paths is a sequence of path segments of type string which are joined together to form a path.

Method returns a String representing the final path.

Throws TypeError if any of the path segments is not a string.

path.join() method Node.js examples

1. Joining various path segments

const path = require('path');

const filePath = path.join("app", "views", "mypage.html");
console.log(filePath);

Output

app/views/mypage.html

2. Normalizing path by removing any extra path separators.

const path = require('path');

const filePath = path.join("app", "/views", "//mypage.html");
console.log(filePath);

Output

app/views/mypage.html

3. Using with __dirname to get the path starting from the directory of currently executing file.

const path = require('path');

const filePath = path.join(__dirname, "views", "mypage.html");
console.log(filePath);

Output

D:\NETJS\NodeJS\nodews\views\mypage.html

Same code in Linux system

const path = require('path');

const filePath = path.join(__dirname, "views", "mypage.html");
console.log(filePath);

Output

/home/netjs/nodeapp/views/mypage.html

4. Using '..' path segment to go one level up. For example, if file is executing in directory D:\NETJS\NodeJS\nodews\views\mypage.html then the following code

const path = require('path');

const filePath = path.join(__dirname, "..", "views", "mypage.html");
console.log(filePath);

gives the output as

D:\NETJS\NodeJS\views\mypage.html

It is because the file where this code resides is in D:\NETJS\NodeJS\nodews and '..' path segment means going one level up meaning D:\NETJS\NodeJS

That's all for this topic Node.js path.join() Method. If you have any doubt or any suggestions to make please drop a comment. Thanks!

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