RedisJSON powered by RediSearch is now out in public preview, offering high-performance document store capabilities on top of Redis open source. Its primary goal is to make JSON objects accessible and searchable within Redis. It provides a more sophisticated data API than the simple hash API, allowing for expansion without multiple keys. To get started with RedisJSON, users can use the Docker container option or connect directly using redis-cli. The example code uses Python and Flask to demonstrate how to create a product catalog service from scratch using RedisJSON's new JSON indexing, querying, and full-text search capabilities.