Configuration (9)

Last updated Oct 1, 2026 K2 streams can be created, updated, and deleted with the REST API.

To create, update, or delete streams, your API token needs the K2 Config Write permission. To get or list streams, it needs the K2 Config Read permission.

Stream settings

Setting Type Required Default Description
name string Yes None 1 to 128 letters, numbers, or underscores. Must be unique in your account. Not case-sensitive.
retention_seconds integer No 604800 How long K2 retains records, from 3600 (one hour) to 2592000 (30 days).
http object Yes None Configures the HTTP input. Refer to HTTP input.
worker_binding object No { enabled: true } Configures the Workers binding input. Refer to Workers binding input.

At least one of http or worker_binding must be enabled.

You cannot rename a stream after you create it.

Inputs

An input is a way for producers to write records to a stream. K2 supports two inputs:

  • HTTP: Producers send records to the stream's /produce endpoint.
  • Workers binding: A Worker sends records through a binding.

HTTP input

Field Type Required Description
enabled boolean Yes Enables the /produce endpoint.
authentication boolean No Requires an API token with the K2 Produce permission to produce. If omitted or false, anyone with the stream endpoint can produce.
cors.origins array of strings No Origins allowed to produce from a browser. Refer to CORS.

Caution

If you do not set authentication to true, the /produce endpoint is public. Anyone who knows the stream ID can write records to the stream.

Authentication

When authentication is true, producers using the HTTP API must send an API token in the Authorization: Bearer <TOKEN> header. The token must have permission to produce to K2 streams (K2 Produce) in the account that owns the stream.

CORS

Configure cors.origins to allow browsers to produce records from a web page. Each entry must be one of the following:

  • An http:// or https:// origin, such as https://example.com. Origins cannot include a path, query string, fragment, or credentials.
  • *, to allow any origin. If you use *, it must be the only entry.

You can configure up to five origins. Each origin must be unique.

Workers binding input

Field Type Required Description
enabled boolean Yes Allows Workers to produce to the stream with a binding.

If you omit worker_binding when you create a stream, the Workers binding input is enabled.

Retention

retention_seconds sets how long K2 retains records after it receives them. The value must be between 3600 (one hour) and 2592000 (30 days). The default is 604800 (seven days).

K2 deletes expired records in the background. Records can remain readable for some time after their retention period ends, so do not rely on retention to remove data at an exact time.

Update a stream

To change a stream's settings, send a PATCH request with the settings to change. You can update retention_seconds, http, and worker_binding. Include at least one of these fields.

curl "https://api.cloudflare.com/client/v4/accounts/$ACCOUNT_ID/k2/streams/$STREAM_ID" \
  --request PATCH \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
    "retention_seconds": 86400,
    "worker_binding": { "enabled": false }
  }'

The response contains the updated stream:

{
    "success": true,
    "errors": [],
    "messages": [],
    "result": {
        "id": "241fa65b438a4d539a19371f58bfdae0",
        "name": "orders",
        "retention_seconds": 86400,
        "endpoint": "https://241fa65b438a4d539a19371f58bfdae0.k2.cloudflarestorage.com",
        "http": {
            "enabled": true,
            "authentication": true
        },
        "worker_binding": {
            "enabled": false
        },
        "created_at": "2026-09-24T21:19:19.246Z",
        "modified_at": "2026-09-29T14:25:54.712Z"
    }
}

When you update an input, the new object replaces the existing one. For example, to add a CORS origin to the HTTP input, send the complete http object, including enabled and authentication. To disable an input, set it to { "enabled": false }. You cannot disable both inputs.

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description: Account, stream, record, and consumer limits for Cloudflare K2. title: Limits image: https://developers.cloudflare.com/k2/platform/limits/og.png?v=ac2d822337ad8e50

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