Nodejs sent a CAPTCHA to the front end, how to store it? Because the front end needs to come back with this verification code for verification.

now there is a CAPTCHA sent, and then the client requests to come back, compare it, and then determine whether it is successful or not. But I don"t know where to store this CAPTCHA! Please give me some advice

Node.js nodejs-express javascript
Mar.13,2021

suggest learning how to get started with database

find

well cache key/value

cookie

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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-64f5-1bf3c5c-3161f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf3c5c-3161f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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