10 - Get Query Parameter Input from the Client - Basic Node and Express - freeCodeCamp Tutorial

An alternate way to receive inputs from URLs is queries. Queries start with a question mark, and have key=value pairs separated by ampersands (&). These will be extracted by express and stored in the query object of the request.

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Concepts: request.query This property is an object containing a property for each query string parameter in the route. When query parser is set to disabled, it is an empty object {}, otherwise it is the result of the configured query parser. https://expressjs.com/en/api.html#req.query

Middleware Middleware functions are functions that have access to the request object (req), the response object (res), and the next middleware function in the application’s request-response cycle. The next middleware function is commonly denoted by a variable named next. http://expressjs.com/en/guide/using-middleware.html

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

response.json() Sends a JSON response. This method sends a response (with the correct content-type) that is the parameter converted to a JSON string using JSON.stringify(). The parameter can be any JSON type, including object, array, string, Boolean, number, or null, and you can also use it to convert other values to JSON. https://expressjs.com/en/api.html#res.json

-————————————————————————————————————- 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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