WRONGTYPE Node.js Origin: Application & API Last updated 15 Oct 2026

WRONGTYPE Operation against a key holding the wrong kind of value

A Redis command was used on a key of a different type (e.g. HGET on a string key).

Exact message you may see WRONGTYPE Operation against a key holding the wrong kind of value
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Seen on: Node.js

Meaning

Each Redis key has one type (string, hash, list, set, zset). Reusing key names across features or changing data shape causes it.

Common causes

  • Same key name used for different data types
  • Data migrated without clearing old keys
  • Bug writing the wrong type

⚡ Quick fix

  1. Check the key type: TYPE key
  2. Use namespaced key names (user:42:profile)
  3. Delete/migrate the old key

Detailed fix by platform

Linux

  1. redis-cli TYPE session:42

How to diagnose

  1. Key — Which key and command?
  2. Type — TYPE key result

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Application & API. Errors that are often confused with or caused by this one (click to open):

DEP0005 — DeprecationWarning: Buffer() is deprecated due to security and usability issues (DEP0005) (Node.js)DEP0005DEP0040 — DeprecationWarning: The `punycode` module is deprecated (DEP0040) (Node.js)DEP0040EADDRINUSE — Error: listen EADDRINUSE: address already in use :::3000 (Node.js)EADDRINUSEError establishing a Redis connection — WordPress: Error establishing a Redis connection (object cache) (WordPress)Error establishing a …listen EACCES — Error: listen EACCES: permission denied 0.0.0.0:80 (Node.js)listen EACCESMODULE_NOT_FOUND — Error: Cannot find module 'x' (MODULE_NOT_FOUND) (Node.js)MODULE_NOT_FOUNDNOAUTH — ReplyError: NOAUTH Authentication required. (Node.js)NOAUTHSyntaxError import — SyntaxError: Cannot use import statement outside a module (Node.js)SyntaxError importWRONGTYPE

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