Cognition and use of JWT

whether JWT belongs to front-end technology or back-end technology
what I think now is that JWT is generated by the back-end, transferred to the front-end storage, and written in the request header for data transfer verification.
is that right?


and before returning a token request carrying token steps are basically the same
backend to generate front-end carrying request
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-64f5-1b3c47d-2c2e7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3c47d-2c2e7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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