Node Redis: Get All Keys (Detailed Guide w/ Code Examples)

Use Case(s)

In Node.js applications, you may need to fetch all keys from a Redis database. This is often used for debugging purposes or when you need to analyze or manipulate all data.

## Code Examples

1. Using KEYS * command:
   CODE_BLOCK_PLACEHOLDER_0
   In this example, KEYS * command is used to fetch all the keys from Redis. The returned keys are then logged to the console.
2. Using SCAN command for large databases:
   CODE_BLOCK_PLACEHOLDER_1
   For larger databases, it's better to use SCAN as KEYS * may end up blocking the server while it fetches all keys. In this example, SCAN is used in a loop until all keys are fetched and logged.

Best Practices

• Avoid using KEYS * command in a production environment as it might affect performance. Instead, use SCAN as it's more efficient and doesn't block the server.

Common Mistakes

• Using KEYS * on large databases can lead to performance issues. It's best to use SCAN for such cases.

FAQs

• Q: Can I filter keys when fetching them from Redis?
  A: Yes, both KEYS and SCAN commands accept a pattern that can be used to filter keys.