In Mongoose, what would I use .pre() middleware function for?

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I am just wondering what mongoose .pre('validate') and .pre('save') would be used for. I know how it works and what it does, but I am not sure what situation I could have that I would use it for. Couldn't I just do everything I need within code? And what is difference between validate and save?

Sorry if these are dumb questions, I've done my research but not sure when to use these features

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1 Answers

We use the .pre() function that is executed before or after a certain action that you specify. When you want to run a function every time before you save a document in the DB, we would you a pre-hook for that.

Example : Before saving a user to the database, you could call a function that would log the user into to a logging service.

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