Get the file name from a URL

Take the last path segment, ignoring the query and fragment.

JavaScript Version 1.0.0 · MIT · .md

function fileNameFromUrl(url) { const path = url.split(/[?#]/)[0]; return path.slice(path.lastIndexOf('/') + 1); }

Input & expected output

"https://example.com/files/invoice-8812.pdf?download=1"

"invoice-8812.pdf"

The edge case

"https://example.com/files/"

""

Know the limits

• The original kept the query string; this version drops ?… and #… first.
• Percent-encoding is not decoded.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Capitalize a string — Uppercase the first Unicode code point and preserve the remaining text.
• Reverse a string — Reverse Unicode code points without splitting surrogate pairs.
• Check a palindrome — Compare a string with its code-point reversal.