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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 can you combine RedisJSON with RedisSearch to enable searching across specific fields within stored JSON documents? 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 atomically increment a numeric value nested within a JSON document using RedisJSON?

Intermediate

Answer

You use the JSON.NUMINCRBY command, specifying the document key, the path to the specific numeric field, and the amount to increase it by, which atomically updates that specific nested value, making it safe even if multiple clients are trying to update the same field simultaneously.
JSON.NUMINCRBY product:55 $.stock -1
Real-world example An inventory system atomically decreases a product's stock count, which is nested within a larger JSON document, using JSON.NUMINCRBY, safely handling many simultaneous purchases without any risk of an incorrect final count.

Common follow-ups: What happens if the target field is not actually a numeric value?;Can JSON.NUMINCRBY target multiple matching fields at once using a wildcard path?

Data Types;Redis CLI & Basic Commands
All 7 RedisJSON questions