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

Use Case(s)

In Node.js applications using Redis as a cache or session store, you may need to delete all keys in scenarios such as:

  • Clearing the cache to refresh data.
  • Deleting all sessions for system maintenance or security reasons.

Code Examples

  1. Using flushdb command:
const redis = require('redis'); const client = redis.createClient(); client.flushdb((err, succeeded) => { console.log(succeeded); // will be true if success });

flushdb is a Redis command that deletes all keys from the current database. This method is handy when you want to clear your entire cache.

  1. Using keys and del commands:
const redis = require('redis'); const client = redis.createClient(); client.keys('*', (err, keys) => { if (err) return console.log(err); for(let i = 0; i < keys.length; i++) { client.del(keys[i], function(err, reply) { console.log(reply); }); } });

In this example, we first call the keys command with the wildcard '*' to fetch all keys in the database. After that, we loop over the keys and delete each one using the del command.

Best Practices

  • Be cautious when using these commands, especially on production databases, as they will permanently delete all your keys.
  • Avoid blocking Redis for a long time when deleting a large number of keys. Consider using the UNLINK command, which is a non-blocking alternative to DEL.

Common Mistakes

  • Not handling errors from flushdb, del, or keys commands.
  • Using these commands on the wrong database or the production environment by mistake.


Q: Can I delete keys matching a specific pattern? A: Yes, in the second code example, replace '' in the keys method with your pattern. For example, 'session:' will match all keys that start with 'session:'.

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