## Write multiple key-value pairs

`client.KV.Namespaces.BulkUpdate(ctx, namespaceID, params) (*NamespaceBulkUpdateResponse, error)`

**put** `/accounts/{account_id}/storage/kv/namespaces/{namespace_id}/bulk`

Write multiple keys and values at once. Body should be an array of up to 10,000 key-value pairs to be stored, along with optional expiration information. Existing values and expirations will be overwritten. If neither `expiration` nor `expiration_ttl` is specified, the key-value pair will never expire. If both are set, `expiration_ttl` is used and `expiration` is ignored. The entire request size must be 100 megabytes or less.

### Parameters

- `namespaceID string`

  Namespace identifier tag.

- `params NamespaceBulkUpdateParams`

  - `AccountID param.Field[string]`

    Path param: Identifier.

  - `Body param.Field[[]NamespaceBulkUpdateParamsBody]`

    Body param

    - `Key string`

      A key's name. The name may be at most 512 bytes. All printable, non-whitespace characters are valid.

    - `Value string`

      A UTF-8 encoded string to be stored, up to 25 MiB in length.

    - `Base64 bool`

      Indicates whether or not the server should base64 decode the value before storing it. Useful for writing values that wouldn't otherwise be valid JSON strings, such as images.

    - `Expiration float64`

      Expires the key at a certain time, measured in number of seconds since the UNIX epoch.

    - `ExpirationTTL float64`

      Expires the key after a number of seconds. Must be at least 60.

    - `Metadata unknown`

      Arbitrary JSON that is associated with a key.

### Returns

- `type NamespaceBulkUpdateResponse struct{…}`

  - `SuccessfulKeyCount float64`

    Number of keys successfully updated.

  - `UnsuccessfulKeys []string`

    Name of the keys that failed to be fully updated. They should be retried.

### Example

```go
package main

import (
  "context"
  "fmt"

  "github.com/cloudflare/cloudflare-go"
  "github.com/cloudflare/cloudflare-go/kv"
  "github.com/cloudflare/cloudflare-go/option"
)

func main() {
  client := cloudflare.NewClient(
    option.WithAPIToken("Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY"),
  )
  response, err := client.KV.Namespaces.BulkUpdate(
    context.TODO(),
    "0f2ac74b498b48028cb68387c421e279",
    kv.NamespaceBulkUpdateParams{
      AccountID: cloudflare.F("023e105f4ecef8ad9ca31a8372d0c353"),
      Body: []kv.NamespaceBulkUpdateParamsBody{kv.NamespaceBulkUpdateParamsBody{
        Key: cloudflare.F("My-Key"),
        Value: cloudflare.F("Some string"),
      }},
    },
  )
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", response.SuccessfulKeyCount)
}
```

#### Response

```json
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "success": true,
  "result": {
    "successful_key_count": 100,
    "unsuccessful_keys": [
      "string"
    ]
  }
}
```