node.js

How to Generate Barcodes in Node.js Using Express, EJS, and JsBarcode Generating barcodes programmatically is a frequent requirement when building inventory systems, invoicing modules, or shipping portals. While many developers rely on heavy client-side libraries or external APIs, you can easily build a server-side barcode generator using Node.js, Express, EJS, and the Canvas package . In this tutorial, we will walk through a complete implementation of a dynamic barcode web app that accepts user input via a form, generates a barcode image server-side using JsBarcode and canvas , and renders it instantly on an EJS template. Prerequisites & Tech Stack Make sure you have Node.js installed on your system. We will use the following packages: Express : Fast, unopinionated web framework for Node.js. EJS : Embedded JavaScript templating engine. Canvas : To provide a headless HTML5 Canvas implementation in...

How to Upload Images in Node.js and Express Using AJAX and jQuery Handling asynchronous file uploads without refreshing the page provides a seamless user experience. In this tutorial, we will explore how to upload an image file using AJAX and jQuery in a Node.js and Express application. We will use the browser's FileReader API to read the selected file as a Data URL, send the Base64-encoded payload to the server via AJAX, and save it directly to the server using Node's fs (File System) module. Project Structure Your project directory should be structured as follows: upload/ ├── views/ │ └── demo.ejs ├── app.js └── package.json Step 1: Set Up Your Project Folder Open your command prompt or terminal and initialize a new directory for your project: mkdir upload cd upload Step 2: Initialize Node.js and Install Dependencies Initialize your Node.js environment by creating a package.json f...

How to Implement Form Validation in Node.js and Express Using Express-Validator Handling user input safely is one of the most critical responsibilities of backend development. Accepting unvalidated data can lead to corrupted databases, broken application states, and severe security vulnerabilities like injection attacks. In this tutorial, we will walk through how to build robust form validation in a Node.js application using Express, EJS, Body-Parser, and the express-validator library . Prerequisites & Tech Stack Make sure you have Node.js installed on your system. We will be using the following packages: Express: Fast, unopinionated web framework for building Node.js applications. Body-Parser: Middleware to extract incoming request data and expose it on req.body . Path: Built-in Node.js module for working with file and directory paths. Express-Validator: A set of Express middlewa...