node.js

Prerequisite Python What Is Flask ? Flask is a lightweight Web framework written in Python. It is developed by  Armin Ronacher. Flask is based on the Werkzeug WSGI toolkit and Jinja2 template engine Setup Development Environment First Install Virtualenv In Python virtualenv  is a virtual python environment builder.virtualenv    is used to manage python packages for different projects. Using virtualenv allows you to avoid installing python packages globally which could break system tools or other projects. Install the virtualenv using the following command.This command needs administrator privileges # pip install virtualenv After installing the virtualenv . Make Folder create new folder using the following command  # mkdir flaskdemo change to the current created directory/folder # cd flaskdemo Create a Virtual Environment for Flask In Folder Now we will create a virtualenv .  The commands below will c...

Introduction 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: #Create a new directory and navigate into it mkdir upload cd upload Step 2: Initialize Node.js and Install Dependencies Initialize your Node.js environment by creating a package.json file automatically: npm init -y This command creates a packa...

Modern web users expect applications to respond instantly—without jarring page reloads or delays. If you want to build fast, reactive web applications, mastering asynchronous data communication is a must. In this comprehensive, step-by-step tutorial, you will learn how to build a dynamic web app using AJAX, Node.js, Express, and MongoDB . We will guide you through creating a full-stack application from scratch using a clean, modular project architecture. You will discover how to connect your Node.js backend to MongoDB via Mongoose models, configure Express routers for asynchronous GET , POST , and DELETE operations, and manipulate the DOM dynamically on the frontend using jQuery AJAX—all without a single page refresh. Project Directory Structure Organize your project files cleanly using the following modular structure: ajax/ ├── models/ │ └── task.js ├── public/ │ └── data.js ├── routes/ │ └── taskroute.js ├── views/ │ └── demo.ejs ├── app.js └── package.json Step 1: ...

Handling bulk data uploads is a frequent requirement in enterprise applications and student record management systems. If you need a reliable way to upload spreadsheet data, parse rows, and store records directly in a database, learning how to process CSV files is essential. In this comprehensive, step-by-step tutorial, you will learn how to import and parse CSV files into MongoDB using Node.js, Express, Multer, and the csvtojson package . We will walk through setting up your project folders, configuring Multer disk storage, converting CSV rows into structured JSON arrays, and rendering records dynamically on an EJS frontend table. Project Structure Organize your project files cleanly with the following architecture: csv/ ├── models/ │ └── csv.js ├── public/ │ └── uploads/ ├── views/ │ └── demo.ejs ├── app.js └── package.json Step 1: Set Up Your Project Folder Open your command prompt or terminal and create your working directory: # Create a new directory and move in...

In this article we see how we can enable the searching of data from server in our node application. Setup The Folder  a) Make a new folder using command prompt.Type the following command. mkdir search b) change to the new folder cd search Setup Node In Folder For setting up node we type the following command npm init -y it will initialize the node in our project. And we get a package.json file in our folder. Which  means node is initialized in our folder. Install Packages Now we install the packages which will be required for building the application. npm install express ejs body-parser mongoose. Add New Folder models views models - this will contain our schema of collections(table). views - will contain the ejs pages.   Model Add new file in folder name it data.js Views Add 2 folders a)pages b)partial In partial folder add 2 new files header.ejs and footer.ejs header.ejs footer.ejs In pages add ho...

Image by Jae Rue from Pixabay Introduction In this article we will be using the bcryptjs javascript library for hashing and compare password.Here we will build a simple api fore register and login.when we will hash the password when user register and then compare that password with hash when they login. What is bcrypt ? bcrypt is a  password hashing function  designed by  Niels Provos  and David Mazières, based on the  Blowfish  cipher, and presented at  USENIX  in 1999.Besides incorporating a  salt  to protect against  rainbow table  attacks, bcrypt is an adaptive function: over time, the iteration count can be increased to make it slower, so it remains resistant to  brute-force search  attacks even with increasing computation power. What is hashing ?  Hashing is a one way function (well, a mapping). It's irreversible, you apply the secure hash algorithm and you cannot ge...