How to fix ERR invalid expire time in 'set' command in Redis

# WRONG - will fail with invalid expire time
SET mykey "value" EX 0
SET mykey "value" EX -10

# CORRECT - use positive integers
SET mykey "value" EX 60
SET mykey "value" EX 3600

// JavaScript example
const ttl = calculateTTL(); // Make sure this returns > 0
if (ttl <= 0) {
  console.error("Invalid TTL:", ttl);
  return; // Or use TTL of 1 as minimum
}
await redis.set(key, value, "EX", ttl);

// WRONG - if expiryTime is in the past, ttl becomes negative
const ttl = Math.floor((expiryTime - Date.now()) / 1000);
await redis.set(sessionKey, data, "EX", ttl); // Fails if ttl < 0

// CORRECT - validate the result
const ttl = Math.floor((expiryTime - Date.now()) / 1000);
if (ttl <= 0) {
  // Key is already expired, skip setting or use minimum TTL
  console.warn("Session already expired");
  return;
}
await redis.set(sessionKey, data, "EX", ttl);

const ttl = Math.max(1, Math.floor((expiryTime - Date.now()) / 1000));
await redis.set(sessionKey, data, "EX", ttl);

// express-session configuration
const sessionConfig = {
  store: new RedisStore({ client: redisClient }),
  secret: "your-secret-key",
  resave: false,
  saveUninitialized: false,
  cookie: {
    secure: true,
    httpOnly: true,
    maxAge: 14 * 24 * 60 * 60 * 1000, // 14 days
  },
  rolling: true, // Refresh session TTL on each request
};

# Preserves the existing TTL while updating the value
SET mykey "new_value" KEEPTTL

// No need to manage TTL for updates
await redis.set(key, newValue, "KEEPTTL");