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Node.js | path.extname() Method
  • Last Updated : 15 Dec, 2020

The path.extname() method is used to get the extension portion of a file path. The extension string returned from the last occurrence of a period (.) in the path to the end of the path string. If there are no periods in the file path, then an empty string is returned.

Syntax:

path.extname( path )

Parameters: This method accepts single parameter path which holds the file path that would be used to extract the extension.

Return Value: It returns a string with the extension portion of the path. It throws a TypeError if this parameter is not a string value.

Below examples illustrate the path.extname() method in node.js:



Example 1:




// Node.js program to demonstrate the   
// path.extname() method
  
// Import the path module
const path = require('path');
   
path1 = path.extname("hello.txt");
console.log(path1)
   
path2 = path.extname("readme.md");
console.log(path2)
   
// File with no extension
// Returns empty string
path3 = path.extname("fileDump")
console.log(path3)
   
// File with blank extension
// Return only the period
path4 = path.extname("example.")
console.log(path4)
   
path5 = path.extname("readme.md.txt")
console.log(path5)
   
// Extension name of the current script
path6 = path.extname(__filename)
console.log(path6)

Output:

.txt
.md

.
.txt
.js

Example 2:




// Node.js program to demonstrate the   
// path.extname() method
  
// Import the path module
const path = require('path');
   
// Comparing extensions from a
// list of file paths
paths_array = [
    "/home/user/website/index.html",
    "/home/user/website/style.css",
    "/home/user/website/bootstrap.css",
    "/home/user/website/main.js",
    "/home/user/website/contact_us.html",
    "/home/user/website/services.html",
]
   
paths_array.forEach(filePath => {
    if (path.extname(filePath) == ".html")
        console.log(filePath);
});

Output:

/home/user/website/index.html
/home/user/website/contact_us.html
/home/user/website/services.html

Reference: https://nodejs.org/api/path.html#path_path_extname_path




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