Determine File Extensions Using JavaScript

Published on March 19, 2008

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A simple PHP function to determine a file’s extension.

fileExt()

function fileExt(path) {
    return path.substr(path.lastIndexOf('.') + 1);
}

Sample Output

Input	Output()
file.ext	ext
/folder/subfolder/file.ext	ext
file.bak.ext	ext

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2 Responses to Determine File Extensions Using JavaScript

Arif Uddin says:

May 20, 2009 at 12:37 pm

genious man… just when i thought reversing the string then find the first occurrence of ‘.’ … i thought search in google… and i get what i need…

thanks again.. for publishing this little code…
Desmond Campbell says:

August 18, 2009 at 10:29 pm

That’s a good script but here’s another one. It takes some people a while to understand that substr function so I wrote another one for the light heads. (I was a light head too so I know how it is)

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Determine File Extensions Using JavaScript

fileExt()

Sample Output

2 Responses to Determine File Extensions Using JavaScript

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