How to trim a file extension from a String in JavaScript?

Question

For example, assuming that x = filename.jpg, I want to get filename, where filename could be any file name (Let\'s assume the file nam

Answer 1

Node.js remove extension from full path keeping directory

https://stackoverflow.com/a/31615711/895245 for example did path/hello.html -> hello, but if you want path/hello.html -> path/hello, you can use this:

#!/usr/bin/env node
const path = require('path');
const filename = 'path/hello.html';
const filename_parsed = path.parse(filename);
console.log(path.join(filename_parsed.dir, filename_parsed.name));

outputs directory as well:

path/hello

https://stackoverflow.com/a/36099196/895245 also achieves this, but I find this approach a bit more semantically pleasing.

Tested in Node.js v10.15.2.

Answer 2

You can perhaps use the assumption that the last dot will be the extension delimiter.

var x = 'filename.jpg';
var f = x.substr(0, x.lastIndexOf('.'));

If file has no extension, it will return empty string. To fix that use this function

function removeExtension(filename){
    var lastDotPosition = filename.lastIndexOf(".");
    if (lastDotPosition === -1) return filename;
    else return filename.substr(0, lastDotPosition);
}

Answer 3

Simple one:

var n = str.lastIndexOf(".");
return n > -1 ? str.substr(0, n) : str;

Answer 4

In Node.js versions prior to 0.12.x:

path.basename(filename, path.extname(filename))

Of course this also works in 0.12.x and later.

Answer 5

The accepted answer strips the last extension part only (.jpeg), which might be a good choice in most cases.

I once had to strip all extensions (.tar.gz) and the file names were restricted to not contain dots (so 2015-01-01.backup.tar would not be a problem):

var name = "2015-01-01_backup.tar.gz";
name.replace(/(\.[^/.]+)+$/, "");

Answer 6

Though it's pretty late, I will add another approach to get the filename without extension using plain old JS-

path.replace(path.substr(path.lastIndexOf('.')), '')