kafkat

Setup

Add these environment variables to connect to your kafka cluster.

Name	Description
KAFKAT_BROKERS	List of brokers (separated by comas)
KAFKAT_SSL	true or false
KAFKAT_SASL_MECHANISM	PLAIN or SCRAM-SHA-256
KAFKAT_SASL_USERNAME	Username
KAFKAT_SASL_PASSWORD	Password
KAFKAT_SCHEMA_REGISTRY	Schema registry host (optional)

Commands

List topics

kafkat topic list [filter-regex] [--json]

# Example
kafkat topic list              # list all topics
kafkat topic list '^alpha.'    # list topics starting with alpha
kafkat topic list --json       # list all topics as json

Create topic

kafkat topic create <topic-name> [--part] [--repl]

# Examples
kafkat topic create orders-topic            # create topic 'orders-topic'
kafkat topic create todo-topic --part 12    # create topic with 6 partitions
kafkat topic create some-topic --repl 3     # create topic with 3 as replication factor
kafkat topic create else-topic --part 6 --repl 1

Delete topics

kafkat topic delete <topic-names...>

# Delete one or many topics
kafkat topic delete orders-topic
kafkat topic delete orders-topic todo-topic some-topic else-topic

Find and delete topics

# delete all topics starting by alpha.
kafkat topic list '^alpha.' | xargs kafkat topic delete

Produce message to topic

# Usage
kafkat produce <topic-name> <message> [--avdl] [--avsc] [--num]

# Produce messages
kafkat produce orders-topic 'some cheese'                # produce message 'some cheese' on orders-topic
kafkat produce orders-topic 'lot of cheese' --num 100    # produce 100 times message

# With schema-registry
kafkat produce todo-topic '{ "title": "buy milk", "dueDate": "2021-02-09" }' --avdl=todo.avdl
kafkat produce milk-topic '{ "name": "can of milk", "amount": "12" }' --avsc=milk.avsc

Consume messages from topic

kafkat consume <topic-name> [--earliest] [--schema] [--grp=group-id]

# Examples
kafkat consume orders-topic               # consume messages from orders-topic from random group id
kafkat consume orders-topic --grp kcli    # consume messages from orders-topic with group id 'kcli'
kafkat consume orders-topic --earliest    # consume messages from beginning (only if new group id)
kafkat consume orders-topic --schema      # decode consumed messages with schema registry

Retrieve consumer group offsets

kafkat offsets <groupId> [--topic] [--regex]

# Examples
kafkat offsets consumer-group-1 --topic orders-topic    # get per partition offsets for a topic
kafkat offsets consumer-group-2 --regex '^alpha.'       # get aggregated offsets for topics matching regex

Manage consumer groups

kafkat consumer-group <groupId> [aliases: cm]

# Examples
kafkat consumer-group delete my-consumer-group-id  # delete a consumer group
kafkat cm delete my-consumer-group-id

Generate typescript interface from avro schema

kafkat avro-ts [--registryId] [--subject] [--avsc]

# Examples
kafkat avro-ts --avsc schema.avsc        # generate typescript from avsc file
kafkat avro-ts --registryId 98           # generate typescript from schema with id 98 in schema registry
kafkat avro-ts --subject orders-value    # generate typescript from subject's latest version in schema registry

Configuration examples

An easy way to switch between different configurations is to create a file config-dev.sh which exports environment variables. Then use source config-dev.sh to load them in the current shell.

Using SASL/SCRAM on Cloud Karafka (single broker) + Schema Registry

export KAFKAT_BROKERS='broker-01.srvs.cloudkafka.com:9094'
export KAFKAT_SSL='true'
export KAFKAT_SASL_MECHANISM='SCRAM-SHA-256'
export KAFKAT_SASL_USERNAME='some-user'
export KAFKAT_SASL_PASSWORD='some-pass'

export KAFKAT_SCHEMA_REGISTRY='https://schema-registry.aws.com:8081'

Using SASL on Confluent Cloud (3 brokers)

export KAFKAT_BROKERS='confluent-cloud-01:9092,confluent-cloud-02:9092,confluent-cloud-03:9092'
export KAFKAT_SSL='true'
export KAFKAT_SASL_MECHANISM='PLAIN'
export KAFKAT_SASL_USERNAME='some-user'
export KAFKAT_SASL_PASSWORD='some-pass'

Using local kafka instance and schema registry

export KAFKAT_BROKERS='localhost:9092'
export KAFKAT_SCHEMA_REGISTRY='http://localhost:8081'

# only if another environment was loaded before
unset KAFKAT_SSL
unset KAFKAT_SASL_MECHANISM
unset KAFKAT_SASL_USERNAME
unset KAFKAT_SASL_PASSWORD

Contributing

Feel free to send Pull Requests.

Tested with

• Node 18.12.1
• npm 8.19.2