javascript - How to replace deprecated HMSET in in node.js REDIS - Stack Overflow

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The Redis mand HMSET has been deprecated since version 4. They suggest using HSET instead. But when trying that I get a different deprecation warning. I was using: db.hmset('key', {a: 1, b: 'c'}). Now I tried to replace it with db.hset but that triggers:

node_redis: Deprecated: The HSET mand contains a argument of type Object.
This is converted to "[object Object]" by using .toString() now and will return an error from v.3.0 on.
Please handle this in your code to make sure everything works as you intended it to.

What is the correct way to store an object in a Redis database?

The documentation for Redis HSET states: 'As of Redis 4.0.0, HSET is variadic and allows for multiple field/value pairs.' I want to store the whole object as it would be using hmset in the database, not its string representation.

The Redis mand HMSET has been deprecated since version 4. They suggest using HSET instead. But when trying that I get a different deprecation warning. I was using: db.hmset('key', {a: 1, b: 'c'}). Now I tried to replace it with db.hset but that triggers:

node_redis: Deprecated: The HSET mand contains a argument of type Object.
This is converted to "[object Object]" by using .toString() now and will return an error from v.3.0 on.
Please handle this in your code to make sure everything works as you intended it to.

What is the correct way to store an object in a Redis database?

The documentation for Redis HSET states: 'As of Redis 4.0.0, HSET is variadic and allows for multiple field/value pairs.' I want to store the whole object as it would be using hmset in the database, not its string representation.

• javascript
• node.js
• redis
• node-redis

Share Improve this question Follow edited Feb 4, 2021 at 16:35 Pavel Dohnal asked Feb 4, 2021 at 14:58 Pavel DohnalPavel Dohnal 2111 silver badge33 bronze badges

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3 Answers 3

Sorted by: Reset to default 2

as described here, redis client dose not support objects in a mand arguments.

To easily store an object in redis you can do:

db.hset('key', ...Object.entries({a: 'a', b: 'b'}), (err) => {
  // ...
});

note that it'll ignore Symbol keys, and work only with "flat objects".

For those using Typescript, the second argument of hSet can be an array of strings of this kind ['k1', 'v1', 'k2', 'v2',...]. So the following code works:

const obj: Record<string, string | number> = {a: 'a', n: 1};
await client.hSet('key', [...Object.entries(obj).flat()]);

Well it seems that the second argument of hset must be a string. If it's not .toString will be applied to it. But as it will return "[object Object]" in your case, the warning triggers. Maybe use JSON.stringify({a: 1, b: 'c'}) as parameter instead

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