06 - Use the .env File - Basic Node and Express - freeCodeCamp Tutorial

Environment Variables allow us to store and retrieve information such as API Keys and Database Passwords from a system. This means we don't have to expose these in our source code. Node can access these from process.env.

Link to challenge : https://www.freecodecamp.org/learn/apis-and-microservices/basic-node-and-express/use-the-.env-file
Written Guide : https://www.notion.so/ganeshh123/Use-the-env-File-4cb1ed9204f34cbebc25c5b7edf48be2

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Concepts:
process.env
The process.env property returns an object containing the user environment.
https://nodejs.org/dist/latest-v8.x/docs/api/process.htm #process_process_env

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

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

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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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