Path & FS Module

Path Module


import path from "path";

path.basename("C:\\Users\\Chak\\Project\\file.md");
// => file.md (Will give the last part)

path.basename("C:\\Users\\Chak\\Project\\file.md", ".md");
// => file (will remove extension)

path.dirname("C:\\User\\Chak\\Project\\file.md");
// => "C:\\User\\Chak\\Project" (Removes file, gives directory)

path.extname("C:\\User\\Chak\\Project\\file.md")
// => .md (extension)

path.join("C:", "Users", "chak", "Documents", "file.txt");
// => C:/Users/chak/Documents/file.txt (Construct file path)

path.normalize("c:\\users\\\chak\\\\Documents\file.txt");
// => c:\users\chak\Documents\file.txt (Normalizes)

path.parse("c:\\users\\chak\\Documents\\file.txt")
// => { root: "C:\\", dir: "c:\\chak\\Documents", ... } (Get Details)

FS Module

It offers three variants:

Promise based

Callback based

Synchronous based

Promise Based


import * as fs from "fs/promises";

// Creating Directory
try {
	await fs.mkdir("C:/nodejs")
	console.log("Folder Created...")
} catch {
	console.error(error);
}

// Creating a folder inside another folder that doesn't exist
// This will give error if nodejs doesn't exist
try {
	await fs.mkdir("C:/nodejs/main")
	console.log("Folder Created...")
} catch {
	console.error(error);
}

// To fix this
fs.mkdir("C:/nodejs/main", recursive: true)

Read Content of Directory


import * as fs from "fs/promises";

// Read the content
try {
	const files = await fs.readdir("c:\\nodejs")
	for(const file of files){
		console.log(file);
	}
} catch (error) {
	console.log(error);
}

Remove directory


import * as fs from "fs/promises";

// Only works if the directory is empty
try {
	await fs.rmdir("C:/nodejs/courses");
} catch (error) {
	console.log(error)
}

Create and write files (this replaces exiting)


await fs.writeFile("README.md", "Hello There");

Reading a file using fs.readFile() gives us buffer

To get the actual file contents and not the buffer


await fs.readFile("README.md", "utf-8");

Read a file, wrap it inside HTML and serve it


const fs = require("fs");
const template = require("./template");

fs.readFile("content.txt", "utf-8", (err, data) => {
  if (err) throw err;

  fs.writeFile("index.html", template(data), (err) => {
    if (err) throw err;
  });
});