JAVASCRIPT

javascript find file extension from string

var ext =  fileName.split('.').pop();

javascript get file extension from string

// Use the lastIndexOf method to find the last period in the string, and get the part of the string after that:

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

get file extention js

function getFileNameWithExt(event) {

  if (!event || !event.target || !event.target.files || event.target.files.length === 0) {
    return;
  }

  const name = event.target.files[0].name;
  const lastDot = name.lastIndexOf('.');

  const fileName = name.substring(0, lastDot);
  const ext = name.substring(lastDot + 1);

  outputfile.value = fileName;
  extension.value = ext;
  
}

how to get file extension in javascript

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

Get file extension in javascript

file.originalname.match(/..*$/)[0]