The problem of the application of the middle layer

the concept of middle layer has been put forward for a long time, but there has been no practical operation. I have written a personal website with koa, so there is a certain foundation. Using the middle layer can mainly reduce the energy consumption of the client and greatly optimize the loading of the first screen. I have also seen some post forums, which are generally written by template engines such as ejs, or Nunjucks. Our project is generally written in front-end with vue, which itself is single-page rendering. So here I would like to ask whether it is necessary to add node middle tier

after using a framework like vue.
Nov.09,2021

the middle tier is used to deal with general logic. Does it have anything to do with what you use?

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bdb13c-30aa2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bdb13c-30aa2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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