Node JS Framework

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 […]

The HTTP method is supplied in the request and specifies the operation that the client has requested. The following table summarizes the commonly used HTTP methods. Sr.No. Method & Description 1 GETThe GET method requests a representation of the specified resource. Requests using GET should only retrieve data and should have no other effect. 2 […]

We can now define routes; they are either static or fixed. To use dynamic routes, we need to provide different types of routes. Using dynamic routes allow us to pass parameters and process based on them. Following is an example of a dynamic route. To test this go to https://localhost:3000/123. You will get the following response. […]

Web frameworks provide resources such as HTML pages, scripts, images, etc. at different routes. Koa does not support routes in the core module. We need to use the Koa-router module to easily create routes in Koa. Install this module using the following command. Now that we have Koa-router installed, let’s look at a simple GET […]