How to get the file name from a full path using JavaScript?

var filename = fullPath.replace(/^.*[\\\/]/, '')

This will handle both \ OR / in paths

Just for the sake of performance, I tested all the answers given here:

var substringTest = function (str) {
    return str.substring(str.lastIndexOf('/')+1);
}

var replaceTest = function (str) {
    return str.replace(/^.*(\\|\/|\:)/, '');
}

var execTest = function (str) {
    return /([^\\]+)$/.exec(str)[1];
}

var splitTest = function (str) {
    return str.split('\\').pop().split('/').pop();
}

substringTest took   0.09508600000000023ms
replaceTest   took   0.049203000000000004ms
execTest      took   0.04859899999999939ms
splitTest     took   0.02505500000000005ms

And the winner is the Split and Pop style answer, Thanks to bobince !

In Node.js, you can use Path's parse module...

var path = require('path');
var file = '/home/user/dir/file.txt';

var filename = path.parse(file).base;
//=> 'file.txt'