Pipelines API Reference

Code templates and verified behavior. For the full SQL function set and HTTP status semantics, pull https://developers.cloudflare.com/pipelines/sql-reference/ and the streams docs.

Worker Binding Interface

// from cloudflare:pipelines / @cloudflare/workers-types
interface Pipeline<T = any> { send(records: T[]): Promise<void>; }

interface Env { MY_STREAM: Pipeline; }

export default {
  async fetch(req: Request, env: Env, ctx: ExecutionContext): Promise<Response> {
    await env.MY_STREAM.send([{ event_id: crypto.randomUUID(), amount: 29.99 }]);
    return new Response("OK");
  }
} satisfies ExportedHandler<Env>;

• send() takes an array, returns Promise<void> (no confirmation payload).
• Throws on network errors — wrap in try/catch or use ctx.waitUntil() for fire-and-forget.
• Validation errors are not thrown here (deferred during processing — see gotchas.md).
• Payload/rate limits apply — check https://developers.cloudflare.com/pipelines/platform/limits/ before sizing batches.

HTTP Ingest

https://{stream-id}.ingest.cloudflare.com

Get {stream-id} from npx wrangler pipelines streams list.

# Batch (preferred)
curl -X POST https://{stream-id}.ingest.cloudflare.com \
  -H "Content-Type: application/json" \
  -d '[{"event_id":"evt-1","amount":29.99},{"event_id":"evt-2","amount":14.99}]'

# Single event — auto-wrapped in an array
curl -X POST https://{stream-id}.ingest.cloudflare.com \
  -H "Content-Type: application/json" -d '{"event_id":"evt-3","amount":9.99}'

If stream auth is enabled, add -H "Authorization: Bearer $TOKEN" (token needs Workers Pipelines Send). Standard HTTP status codes apply (400 invalid, 401 auth, 413 too large, 429 rate-limited, 5xx retry).

JSON only — no Avro, Protobuf, or CSV input.

REST Management API

Base: https://api.cloudflare.com/client/v4/accounts/$ACCOUNT_ID/pipelines/v1

# List
curl -s "$BASE_URL/streams"   -H "Authorization: Bearer $API_TOKEN"
curl -s "$BASE_URL/sinks"     -H "Authorization: Bearer $API_TOKEN"
curl -s "$BASE_URL/pipelines" -H "Authorization: Bearer $API_TOKEN"

# Get one (pipeline GET includes status + failure_reason — useful for debugging)
curl -s "$BASE_URL/pipelines/{pipeline-id}" -H "Authorization: Bearer $API_TOKEN"

# Delete in reverse order: pipeline → sink → stream
curl -X DELETE "$BASE_URL/pipelines/{id}" -H "Authorization: Bearer $API_TOKEN"
curl -X DELETE "$BASE_URL/sinks/{id}"     -H "Authorization: Bearer $API_TOKEN"
curl -X DELETE "$BASE_URL/streams/{id}"   -H "Authorization: Bearer $API_TOKEN"

wrangler pipelines delete defaults to "no" non-interactively — use the REST API for automated cleanup. Deleting a stream removes buffered events and dependent pipelines.

Pipeline Lifecycle States

A GET on a sink shows schema.fields: [] — expected. The sink inherits schema from the stream via the pipeline SQL.

Pipeline SQL (Transforms)

Row-level only — no GROUP BY/aggregation. CTEs (WITH) and UNNEST are supported. Full function list: https://developers.cloudflare.com/pipelines/sql-reference/.

-- Passthrough / filter / enrich
INSERT INTO my_sink SELECT * FROM my_stream;
INSERT INTO my_sink SELECT * FROM my_stream WHERE amount > 10;
INSERT INTO my_sink
SELECT event_id, UPPER(category) AS category, amount * 1.1 AS amount_with_tax
FROM my_stream;

-- CTE
WITH filtered AS (SELECT event_id, amount FROM my_stream WHERE amount > 50)
INSERT INTO my_sink SELECT * FROM filtered;

-- UNNEST arrays (one per SELECT)
SELECT UNNEST(tags) AS tag FROM my_stream;

Supported categories: string, regex, hashing (sha256), JSON extraction, timestamp conversion, conditional (CASE), CAST, COALESCE, math/comparison operators.

Verifying End-to-End Data Flow

# 1. Pipeline running (not initializing/failed)?
curl -s "$BASE_URL/pipelines/{id}" -H "Authorization: Bearer $API_TOKEN"

# 2. Table created yet? (3–7 min on first flush)
curl -s "https://api.cloudflare.com/client/v4/accounts/$ACCOUNT_ID/r2-catalog/$BUCKET/namespaces/my_ns/tables" \
  -H "Authorization: Bearer $API_TOKEN"

# 3. Data present? (R2 SQL)
curl -s -X POST \
  "https://api.sql.cloudflarestorage.com/api/v1/accounts/$ACCOUNT_ID/r2-sql/query/$BUCKET" \
  -H "Authorization: Bearer $API_TOKEN" -H "Content-Type: application/json" \
  -d '{"query": "SELECT COUNT(*) AS total FROM my_ns.my_table"}'

Expect 3–7 minutes from first send to first queryable data. Subsequent flushes are much faster.

See Also

• configuration.md — creating resources · patterns.md — producers, Logpush, observability
• r2-sql/api.md — querying results