# DECRBY

> Decrement the integer value of a key by a given number.

If a key does not exist, it is initialized as 0 before performing the operation. An error is returned if the key contains a value of the wrong type or contains a string that can not be represented as integer.

## Arguments

<ParamField body="key" type="string"required>
The key to decrement.
</ParamField>
<ParamField body="decrementBy" type="integer" required>
The amount to decrement by.
</ParamField>


## Response

<ResponseField  type="integer" required>
The value at the key after the decrementing.
</ResponseField>

<RequestExample>
```ts Example
await redis.set("key", 6);
await redis.decrby("key", 4);
// returns 2
```
</RequestExample>