js function to get filename from url

Question

I have a url like http://www.example.com/blah/th.html

I need a javascript function to give me the \'th\' value from that.

All my urls have the same format (2

Answer 1

For node and browsers, based on @pauls answer but solving issues with hash and more defensive:

export function getFileNameFromUrl(url) {
  const hashIndex = url.indexOf('#')
  url = hashIndex !== -1 ? url.substring(0, hashIndex) : url
  return (url.split('/').pop() || '').replace(/[\?].*$/g, '')
} 

Few cases:

describe('getFileNameFromUrl', () => {

  it('absolute, hash and no extension', () => {
    expect(getFileNameFromUrl(
      'https://foo.bar/qs/bar/js-function-to-get-filename-from-url#comment95124061_53560218'))
    .toBe('js-function-to-get-filename-from-url')
  })

  it('relative, extension and parameters', () => {
    expect(getFileNameFromUrl('../foo.png?ar=8')).toBe('foo.png')
  })

  it('file name with multiple dots, hash with slash', () => {
    expect(getFileNameFromUrl('questions/511761/js-function.min.js?bar=9.9&y=1#/src/jjj?=9.9')).toBe('js-function.min.js')
  })
})