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NOTE : I do not have enough reputation for the comment, or else this should be comment.

The correct mark answer has a minor issue. The session Prefix is duplicated.

const generateSessionKey = (req) => {
  const userId = req.session?.user?.id ? req.session.user.id : '';
  const randomId = Math.random().toString(36).substring(2);
  return `session:${userId}:${randomId}`; // <-------- either put session here or in prefix, if it is present at both places then we will have duplicated and in the query we will never get keys.
};

app.use(
  session({
    store: new RedisStore({ client: redisClient, prefix: 'session:' }),
    secret: 'your-secret-key',
    resave: false,
    saveUninitialized: false,
    genid: generateSessionKey, // Use the custom session key generator
  })
);

//to delete the sessions 
app.post("/clear-sessions",async (req,res,next)=>{
  const sessions = await redisClient.keys(`session:${req.user.id}:*`);
  await redisClient.del(sessions);
res.send("OK")
  
})

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