how to get extension from file name javascript code example

Example 1: javascript get file extension

var fileName = "myDocument.pdf";
var fileExtension = fileName.split('.').pop(); //"pdf"

Example 2: how to get the extension from filename using javascript

var ext = fileName.substr(fileName.lastIndexOf('.') + 1);

Example 3: how to get file extension in javascript

var fileName = "myDocument.pdf";
var fileExtension = fileName.split('.').pop(); //"pdf"