Navigate to your Kafka bin/windows directory and start your power shell console. Use one of following commands.

Manually add messages one by one

./kafka-console-producer.bat --broker-list kafka:9092 --topic test
>value1
>value2

Manually add messages with keys one by one

> ./kafka-console-producer.bat --broker-list kafka:9092 --topic test --property "parse.key=true" --property "key.separator=;"
>key1;value1
>key2;value2

Just add parse.key and key.separator properties. The example uses ; but there is nothing special about it, one can use any other character.

Automatically add multiple messages with keys

 1..1000 | %{"Key$_;Message$_"} | Write-Output | ./kafka-console-producer.bat --property "parse.key=true" --property "key.separator=;" --broker-list kafka:9092 --topic test

The command adds 1000 messages with keys using simple PowerShell script.

• 1..1000 generates numbers from 1 to 1000, adjust numbers according to your needs.
• %{"Key$_;Message$_"} for each number string is prepared with key and value separated by ;. $_ is PowerShell context variable that is equal to a currently processed number.
• Write-Output sends all the generated strings to standard input of kafka-console-producer.