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What is RedisJSON, and how does it improve working with JSON data compared to storing it as a plain string? How do you set and retrieve a specific nested field within a JSON document using RedisJSON's path syntax? How do you work with arrays within a JSON document stored in Redis, such as adding a new item to an existing array? How do you atomically increment a numeric value nested within a JSON document using RedisJSON? How would you design a document based data model using RedisJSON for an application that would traditionally use a document database like MongoDB? What are the performance and memory considerations when storing very large or deeply nested JSON documents using RedisJSON?
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How can you combine RedisJSON with RedisSearch to enable searching across specific fields within stored JSON documents?

Intermediate

Answer

You create a search index using RedisSearch that specifically defines certain fields within your JSON documents as searchable, and RedisSearch then automatically indexes those fields as JSON documents are added or updated, letting you run rich search queries directly against structured data stored using RedisJSON.
FT.CREATE product_idx ON JSON PREFIX 1 product: SCHEMA $.name AS name TEXT $.price AS price NUMERIC
FT.SEARCH product_idx '@name:laptop'
Real-world example An e-commerce platform combines RedisJSON for storing detailed product documents with RedisSearch for building a fast, flexible product search feature across specific fields like name and price within those documents.

Common follow-ups: Does every field in a JSON document need to be indexed, or can you choose specific ones?;What happens to the search index when a JSON document is updated?

RedisSearch (Full Text Search);Redis Modules Overview
All 7 RedisJSON questions