You can find the Github Repository here.

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Installation

npm install @upstash/kafka

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Quickstart

  1. Go to upstash and select your cluster.
  2. Copy the REST API secrets at the bottom of the page
import { Kafka } from "@upstash/kafka";

const kafka = new Kafka({
  url: "<UPSTASH_KAFKA_REST_URL>",
  username: "<UPSTASH_KAFKA_REST_USERNAME>",
  password: "<UPSTASH_KAFKA_REST_PASSWORD>",
});

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Produce a single message

const p = kafka.producer();
const message = { hello: "world" }; // Objects will get serialized using `JSON.stringify`
const res = await p.produce("<my.topic>", message);
const res = await p.produce("<my.topic>", message, {
  partition: 1,
  timestamp: 12345,
  key: "<custom key>",
  headers: [{ key: "traceId", value: "85a9f12" }],
});

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Produce multiple messages.

The same options from the example above can be set for every message. 
const p = kafka.producer();
const res = await p.produceMany([
  {
    topic: "my.topic",
    value: { hello: "world" },
    // ...options
  },
  {
    topic: "another.topic",
    value: "another message",
    // ...options
  },
]);

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Consume

The first time a consumer is created, it needs to figure out the group coordinator by asking the Kafka brokers and joins the consumer group. This process takes some time to complete. That’s why when a consumer instance is created first time, it may return empty messages until consumer group coordination is completed. 
const c = kafka.consumer();
const messages = await c.consume({
  consumerGroupId: "group_1",
  instanceId: "instance_1",
  topics: ["test.topic"],
  autoOffsetReset: "earliest",
});
More examples can be found in the docstring

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Commit manually

While consume can handle committing automatically, you can also use Consumer.commit to manually commit. 
const consumerGroupId = "mygroup";
const instanceId = "myinstance";
const topic = "my.topic";

const c = kafka.consumer();
const messages = await c.consume({
  consumerGroupId,
  instanceId,
  topics: [topic],
  autoCommit: false,
});

for (const message of messages) {
  // message handling logic

  await c.commit({
    consumerGroupId,
    instanceId,
    offset: {
      topic: message.topic,
      partition: message.partition,
      offset: message.offset,
    },
  });
}

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Fetch

You can also manage offsets manually by using Consumer.fetch 
const c = kafka.consumer();
const messages = await c.fetch({
  topic: "greeting",
  partition: 3,
  offset: 42,
  timeout: 1000,
});

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Examples

See examples as well as various examples in the docstrings of each method.