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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 work with arrays within a JSON document stored in Redis, such as adding a new item to an existing array? How can you combine RedisJSON with RedisSearch to enable searching across specific fields within stored JSON documents? 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 do you set and retrieve a specific nested field within a JSON document using RedisJSON's path syntax?

Beginner

Answer

You use JSON.SET or JSON.GET along with a JSONPath expression that identifies the specific field you want to target, using a dollar sign to represent the document's root and dot notation to navigate into nested objects, letting you work with just the specific piece of data you actually need.
JSON.SET user:100 $.address.zipCode '"02108"'
JSON.GET user:100 $.address.zipCode
Real-world example An address update feature modifies just a user's zip code field directly within their stored JSON document, without touching any of the other unrelated fields in that same document.

Common follow-ups: What is the JSONPath syntax for accessing an item within an array?;What happens if the specified path does not exist within the document?

Data Types;Redis Modules Overview
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