Deployment is the hardest part in the lives of computer coders, it's harder than making apps and games. Any game that you have ever used for example on your computer had to go through many operations to be in the final form it is when you first bought it. The last operation is deployment as you might have guessed. It's about getting your video game ready to use and play on any computer out there. Many issues could happen while deploying the game since we have many environments to deal with these days.
Middlewares in Javascript are functions that come in the middle of the request-response cycle. They have access to both the request and the response object as well as the next middleware function to be executed; usually called next(). Popular examples on middleware include: body-parser, cors, session, cookie-seesion and cookie-parser.
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