{
  "title": "@upstash/kafka",
  "description": "A fully typed Kafka client built for Upstash Kafka and HTTP, perfect for serverless and edge runtimes",
  "date": "2022-01-08T00:00:00.000Z",
  "url": "https://upstash.com/kafka",
  "repository": "upstash/upstash-kafka",
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    "raw": "\n\nAn HTTP/REST based Kafka client built on top of\n[Upstash REST API](https://docs.upstash.com/kafka/rest).\n\nIt is the only connectionless (HTTP based) Kafka client and designed for:\n\n- Serverless functions (AWS Lambda ...)\n- Cloudflare Workers (see the example)\n- Fastly Compute@Edge\n- Next.js Edge, Remix ...\n- Client side web/mobile applications\n- WebAssembly and other environments where HTTP is preferred over TCP\n  connections.\n\n# Installation\n\n```bash\nnpm install @upstash/kafka\n```\n\n# Quickstart\n\n## Auth\n\n1. Go to [upstash](https://console.upstash.com/kafka) and select your database.\n2. Copy the `REST API` secrets at the bottom of the page\n\n```typescript\nimport { Kafka } from \"@upstash/kafka\"\n\nconst kafka = new Kafka({\n  url: \"<UPSTASH_KAFKA_REST_URL>\",\n  username: \"<UPSTASH_KAFKA_REST_USERNAME>\",\n  password: \"<UPSTASH_KAFKA_REST_PASSWORD>\",\n})\n```\n\n## Produce a single message\n\n```typescript\nconst p = kafka.producer()\nconst message = { hello: \"world\" } // Objects will get serialized using `JSON.stringify`\nconst res = await p.produce(\"<my.topic>\", message)\nconst res = await p.produce(\"<my.topic>\", message, {\n  partition: 1,\n  timestamp: 12345,\n  key: \"<custom key>\",\n  headers: [{ key: \"traceId\", value: \"85a9f12\" }],\n})\n```\n\n## Produce multiple messages.\n\nThe same options from the example above can be set for every message.\n\n```typescript\nconst p = kafka.producer()\nconst res = await p.produceMany([\n  {\n    topic: \"my.topic\",\n    value: { hello: \"world\" },\n    // ...options\n  },\n  {\n    topic: \"another.topic\",\n    value: \"another message\",\n    // ...options\n  },\n])\n```\n\n## Consume\n\nThe first time a consumer is created, it needs to figure out the group\ncoordinator by asking the Kafka brokers and joins the consumer group. This\nprocess takes some time to complete. That's why when a consumer instance is\ncreated first time, it may return empty messages until consumer group\ncoordination is completed.\n\n```typescript\nconst c = kafka.consumer()\nconst messages = await c.consume({\n  consumerGroupId: \"group_1\",\n  instanceId: \"instance_1\",\n  topics: [\"test.topic\"],\n  autoOffsetReset: \"earliest\",\n})\n```\n\nMore examples can be found in the\n[docstring](https://github.com/upstash/upstash-kafka/blob/main/pkg/consumer.ts#L265)\n\n## Commit manually\n\nWhile `consume` can handle committing automatically, you can also use\n`Consumer.commit` to manually commit.\n\n```typescript\nconst consumerGroupId = \"mygroup\"\nconst instanceId = \"myinstance\"\nconst topic = \"my.topic\"\n\nconst c = kafka.consumer()\nconst messages = await c.consume({\n  consumerGroupId,\n  instanceId,\n  topics: [topic],\n  autoCommit: false,\n})\n\nfor (const message of messages) {\n  // message handling logic\n\n  await c.commit({\n    consumerGroupId,\n    instanceId,\n    offset: {\n      topic: message.topic,\n      partition: message.partition,\n      offset: message.offset,\n    },\n  })\n}\n```\n\n## Fetch\n\nYou can also manage offsets manually by using `Consumer.fetch`\n\n```typescript\nconst c = kafka.consumer()\nconst messages = await c.fetch({\n  topic: \"greeting\",\n  partition: 3,\n  offset: 42,\n  timeout: 1000,\n})\n```\n\n## Examples\n\nSee [/examples](https://github.com/upstash/upstash-kafka/tree/main/examples) as\nwell as various examples in the docstrings of each method.\n\n# Contributing\n\n## Requirements\n\n- [nodejs](https://nodejs.org) v14.x or higher\n- [pnpm](https://pnpm.io/installation)\n\n## Setup\n\n0. Install dependencies using `pnpm install`\n1. Create a kafka instance on upstash.\n   [docs](https://docs.upstash.com/kafka#create-a-kafka-cluster)\n2. Create the following topics: `blue`, `red`, `green`.\n   [docs](https://docs.upstash.com/kafka#create-a-topic)\n\n   The partitions or retention settings don't matter at this time.\n\n3. Create `.env` file with your kafka secrets `cp .env.example .env`\n\n## Running tests\n\n```bash\npnpm test\n```\n",
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