My WordPress Blog
My WordPress Blog
One of the most exciting new features of JavaScript ES6 is a new breed of function, called a generator. Before generators, the whole script was used to usually execute in a top to bottom order, without an easy way to stop code execution and resuming with the same stack later. Generators are functions which can […]
Once we have set up the development, it is time to start developing our first app using Koa. Create a new file called app.js and type the following in it. Save the file, go to your terminal and type. This will start the server. To test this app, open your browser and go to https://localhost:3000 and you should receive […]
To get started with developing using the Koa framework, you need to have Node and npm (node package manager) installed. If you don’t already have these, head over to Node setup to install node on your local system. Confirm that node and npm are installed by running the following commands in your terminal. You should receive an […]
What is Koa? Koa provides a minimal interface to build applications. It is a very small framework (600 LoC) which provides the required tools to build apps and is quite flexible. There are numerous modules available on npm for Koa, which can be directly plugged into it. Koa can be thought of as the core […]
For real-time communication, you can use WebSockets with the ws library or socket.io. a. Install Socket.IO b. Set Up Socket.IO In app.js:
Handle file uploads using middleware like multer. a. Install Multer b. Configure Multer In app.js: Here, dest specifies the directory where files will be stored, and upload.single(‘file’) handles single file uploads.
Securing your Express application is crucial to prevent common vulnerabilities. Here are some best practices and tools to help with that. a. Helmet Helmet helps secure your Express apps by setting various HTTP headers. In your app.js: b. Rate Limiting Limit the number of requests from a single IP to prevent abuse. In your app.js: […]
Testing is crucial for ensuring your application works correctly. a. Install Testing Libraries For unit and integration tests, you might use libraries like Mocha and Chai. b. Write Tests Create a test directory and a test file, e.g., test/app.test.js: c. Run Tests Add a test script in package.json: Run your tests:
Use environment variables to manage configuration, like database connection strings, API keys, etc. a. Install dotenv b. Create a .env File c. Use Environment Variables In app.js:
Express can manage sessions using middleware like express-session. a. Install express-session b. Configure Sessions c. Use Sessions