Using json vs string values in Redis

Question

I'm evaluating redis to understand between json vs string what provides better retrieval performance. As POC I set below json in redis as both json and string values and noticed that the size of JSON value is more than String - please see attached screen shots.

json value size = 239B string value size = 136B For this POC I used redis-stack-server on my mac.

Based on what I noticed, I have three questions.

Why size of JSON value is more than String
Why retrieval of JSON values is slower than String
What is the best alternate to Redis that could provide me better performance as caching layer for APIs

{key:"HbaJsv"location:339secret:"nD9pVeqZIxAIPsY"delta:6}

String values screenshot
Json values screenshot

This is a sample of the code I used.

import redis

client = redis.Redis(host='localhost', port=6677)
doc = {key:"HbaJsv"location:339secret:"nD9pVeqZIxAIPsY"delta:6}
client.json().set("some_hash1", '$', doc)
client.set("some_hash2", json.dumps(doc))

Lior Kogan · Accepted Answer · 2023-08-18 07:41:55Z

4

If you'd only like to retrieve JSONs by their key - you can use Strings.

But on Redis Stack you can also execute JSONpath queries over JSON documents, as well as index and query JSON documents.

Of course, to support such operations, Redis stores JSON documents differently than simple strings.

answered Aug 18, 2023 at 7:41

Lior Kogan

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