The node fs package has the following methods to list a directory:
fs.readdir(path, [callback]) Asynchronous readdir(3). Reads the contents of a directory. The callback gets two arguments (err, files) where files is an array of the names of the files in the directory excluding '.' and '..'.
fs.readdirSync(path) Synchronous readdir(3). Returns an array of filenames excluding '.' and '..
But how do I get a list of files matching a file specification, for example *.txt?
const fs = require('fs');
const path = require('path');
// Path to the directory(folder) to look into
const dirPath = path.resolve(`${__dirname}../../../../../tests_output`);
// Read all files with .txt extension in the specified folder above
const filesList = fs.readdirSync(dirPath, (err, files) => files.filter((e) => path.extname(e).toLowerCase() === '.txt'));
// Read the content of the first file with .txt extension in the folder
const data = fs.readFileSync(path.resolve(`${__dirname}../../../../../tests_output/${filesList[0]}`), 'utf8');