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Cover image for WRONGTYPE Operation against a key holding the wrong kind of value
Manuel Alférez Ruiz
Manuel Alférez Ruiz

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WRONGTYPE Operation against a key holding the wrong kind of value

#kv #vercelkv #vercel #nextjs

The error arises when attempting a KV operation (set or get) in Vercel after creating an entry using a different data structure.

Replicating the error 

await kv.set('userSession', '123abc');
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Subsequently, we opt to change the data structure.

await kv.hset('userSession', { userId: 123, email: 'ex@example.com' });
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Error:

UpstashError: WRONGTYPE Operation against a key holding the wrong kind of value, command was: ["hset","userSession", ...]
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Solution

Remove the key from Vercel before modifying the data structure.

  1. Go to Vercel: https://vercel.com/dashboard/stores/kv
  2. Delete that key: 
DEL userSession
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