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Redis

With Redis you can use Pub/Sub to subscribe on a specific channel, or Key/Value to get the value assigned to a key.
For Key/Value, Capture can retrieve data from string keys and JSON keys.

With a JSON key, it is possible to retrieve a specific value within a JSON object.
The mapping should have this format: Key|JsonPath
Example: Key1|$.value3

This will retrieve the value of the property 'value3' in the JSON stored in the key 'Key1'.

JsonPath syntax: https://redis.io/docs/data-types/json/path/

You can find a list of special data types you can send here.