> ## Documentation Index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# INCRBY

> Increment 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="incrementBy" type="integer" required>
  The amount to increment by.
</ParamField>

## Response

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

<RequestExample>
  ```ts Example theme={"system"}
  await redis.set("key", 6);
  await redis.incrby("key", 4);
  // returns 10
  ```
</RequestExample>