A server that listens for HTTP requests on a port.We can observe the following components in this application:
When we run this application in Node.js, we will have an HTTP server listening on port 3000 which can respond to a GET request to the URL: respond with a text message: response for GET request. Define route for GET request on path '/' Express provides methods to specify the function to be called for a particular HTTP verb (GET, POST, SET, etc.) and URL pattern (“Route”).Ī typical Express application looks like this: What is Express?Įxpress is a popular Node.js framework for authoring web applications. Similarly, we can find the installation instructions for Node.js on its official website. We can refer to the npm site for the installation instructions for npm. To use Express, we have to first install Node.js and npm in our development environment.
This makes the runtime engine much faster and hence enables faster processing of requests. Node.js uses the V8 JavaScript Runtime engine which is also used by Google Chrome web browser developed by Google. A unique feature of Node.js runtime is that it is a non-blocking, event-driven input/output(I/O) request processing model. Node.js is an open-source runtime environment for executing server-side JavaScript applications. This article is accompanied by a working code example on GitHub.Ī basic understanding of Node.js is essential for working with Express. In this article, we will introduce the Express framework and learn to use it to build HTTP servers, REST APIs, and web pages using both JavaScript and TypeScript. We can use this framework to build APIs, serve web pages, and other static assets and use it as a lightweight HTTP server and backend for our applications.
Express is a web application framework for Node.js.
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