02 - Start a Working Express Server - Basic Node and Express - freeCodeCamp Tutorial

We look at how to create an Express server app, and set up a basic route to return a string. We can import express with require(), call express() to create an app, start the server by calling listen() with a port number. A GET route can be set with app.get(), giving a path and a function to run.

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Concepts: require() Used to import modules, JSON, and local files. Modules can be imported from node_modules. https://nodejs.org/api/modules.html#modules_require_id

express() Creates an Express application. The express() function is a top-level function exported by the express module. https://expressjs.com/en/5x/api.html

app.listen() Binds and listens for connections on the specified host and port. This method is identical to Node’s http.Server.listen(). If port is omitted or is 0, the operating system will assign an arbitrary unused port, which is useful for cases like automated tasks (tests, etc.). https://expressjs.com/en/5x/api.html#app.listen

app.get() Routes HTTP GET requests to the specified path with the specified callback functions. https://expressjs.com/en/5x/api.html#app.get.method

-————————————————————————————————————- Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside a web browser. Node.js lets developers use JavaScript to write command line tools and for server-side scripting—running scripts server-side to produce dynamic web page content before the page is sent to the user's web browser.

Express.js, or simply Express, is a web application framework for Node.js. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js. Express runs between the server created by Node.js and the frontend pages of a web application. Express also handles an application's routing.

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