10 - Get Query Parameter Input from the Client - Basic Node and Express - freeCodeCamp Tutorial
Channel: Ganesh H
Date: 2020-07-07

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.

Link to challenge : https://www.freecodecamp.org/learn/apis-and-microservices/basic-node-and-express/get-query-parameter-input-from-the-client
Written Guide : https://www.notion.so/ganeshh123/Get-Query-Parameter-Input-from-the-Client-298614fe48884ddbbf50a7dd223bc6f7

Full Playlist for this course : https://www.youtube.com/playlist?list=PLhGp6N0DI_1SdIZ3uhbXnKAq2UcICSnWS
All Writen Guides for this course : https://www.notion.so/ganeshh123/dab5e189407244c793c2f32d066eee9f
All My Tutorials can be found at : https://www.notion.so/Tutorials-Ganesh-H-293ea420d34a464f9a1907e0405b5f26

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 

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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.

freeCodeCamp (also referred to as “Free Code Camp”) is a non-profit organization that consists of an interactive learning web platform, an online community forum, chat rooms, online publications and local organizations that intend to make learning web development accessible to anyone. Beginning with tutorials that introduce students to HTML, CSS and JavaScript, students progress to project assignments that they complete either alone or in pairs. Upon completion of all project tasks, students are partnered with other nonprofits to build web applications, giving the students practical development experience.

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