How To Find Files By Extension In Node JS?

We will use fs npm package for filter by file extension in folder recursively using node.js. fs package provide readdirSync() and statSync() for search file by extension. let's see simple example

Step 1: Create Node App

run bellow command and create node app.

mkdir my-app
cd my-app
npm init

Step 2: Create server.js file

Make sure, you have add file on "uploads/" folder with some files path.

server.js

var fs = require('fs');
var path = require('path');
function findFileByExt(folderPath, ext) 
{
    var files = fs.readdirSync(folderPath);
    var result = [];
    files.forEach( 
        function (file) {
            var newbase = path.join(folderPath,file);
            if ( fs.statSync(newbase).isDirectory() ){
                result = findFileByExt(newbase,ext,fs.readdirSync(newbase),result);
            } else             {
                if ( file.substr(-1*(ext.length+1)) == '.' + ext ){
                    result.push(newbase);
                } 
            }
        }
    )
    return result;
}
var folderPath = './uploads';
var files = findFileByExt(folderPath, 'png');
console.log(files);

now you can simply run by following command:

node server.js

Output:

I hope it can help you...