Author: saqibkhan

Cookies are simple, small files/data that are sent to client with a server request and stored on the client side. Every time the user loads the website back, this cookie is sent with the request. This helps keep track of the users actions. There are numerous uses of HTTP Cookies. To use cookies with Koa,…

Static files are files that clients download as they are from the server. Create a new directory, public. Express, by default doesn’t allow you to serve static files. We need a middleware to serve this purpose. Go ahead and install koa-serve − Now we need to use this middleware. Before that create a directory called public. We will store all…

eb applications need to provide the functionality to allow file uploads. Let us see how we can receive files from the clients and store them on our server. We have already used the koa-body middleware for parsing requests. This middleware is also used for handling file uploads. Let us create a form that allows us…

Forms are an integral part of the web. Almost every website we visit offers us forms that submit or fetch some information for us. To get started with forms, we will first install the koa-body. To install this, go to your terminal and use − Replace your app.js file contents with the following code. The…

Pug is a templating engine. Templating engines are used to remove the cluttering of our server code with HTML, concatenating strings wildly to existing HTML templates. Pug is a very powerful templating engine, which has a variety of features such as filters, includes, inheritance, interpolation, etc. There is a lot of ground to cover on this.…

Middleware functions are functions that have access to the context object and the next middleware function in the application’s request-response cycle. These functions are used to modify the request and response objects for tasks such as parsing request bodies, adding response headers, etc. Koa goes a step further by yielding ‘downstream’, then flowing the control back ‘upstream’. This effect…

Error handling plays an important part in building web applications. Koa uses middleware for this purpose as well. In Koa, you add a middleware that does try { yield next } as one of the first middleware. If we encounter any error downstream, we return to the associated catch clause and handle the error here. For example…

Redirection is very important when creating websites. If a malformed URL is requested or there are some errors on your server, you should redirect them to the respective error pages. Redirects can also be used to keep people out of restricted areas of your website. Let us create an error page and redirect to that…

A Koa Response object is an abstraction on top of node’s vanilla response object, providing additional functionality that is useful for everyday HTTP server development. The Koa response object is embedded in the context object, this. Let’s log out the response object whenever we get a request. When you run this code and navigate to https://localhost:3000/hello then you’ll…

A Koa Request object is an abstraction on top of node’s vanilla request object, providing additional functionality that is useful for everyday HTTP server development. The Koa request object is embedded in the context object, this. Let’s log out the request object whenever we get a request. When you run this code and navigate to https://localhost:3000/hello, then…