Any big enough web project has a lot of things which can be configured here and there. What is the current application environment? What port should server be listening for incoming connections? What is our publicly available hostname we should use for links in generated emails? Should SMS messages be sent or just logged to save some money on testing stages? What about reporting data to New Relic, should it be working? All of those are settings.

Another part of configurable parameters are secrets. Starting from session secret which is used to generate secure JWT token and going on to…

Sergey Tsvetkov

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