@node-redis/json

This package provides support for the RedisJSON module, which adds JSON as a native data type to Redis. It extends the Node Redis client to include functions for each of the RedisJSON commands.

To use these extra commands, your Redis server must have the RedisJSON module installed.

Usage

For a complete example, see managing-json.js in the Node Redis examples folder.

$3

The JSON.SET command stores a JSON value at a given JSON Path in a Redis key.

Here, we'll store a JSON document in the root of the Redis key "mydoc":

``javascript
import { createClient } from 'redis';

...
await client.json.set('noderedis:jsondata', '$', {
name: 'Roberta McDonald',
pets: [
{
name: 'Rex',
species: 'dog',
age: 3,
isMammal: true
},
{
name: 'Goldie',
species: 'fish',
age: 2,
isMammal: false
}
]
});
`

For more information about RedisJSON's path syntax, check out the documentation.

$3

With RedisJSON, we can retrieve all or part(s) of a JSON document using the [JSON.GET]() command and one or more JSON Paths. Let's get the name and age of one of the pets:

`javascript
const results = await client.json.get('noderedis:jsondata', {
path: [
'.pets[1].name',
'.pets[1].age'
]
});
`

results will contain the following:

`javascript
{ '.pets[1].name': 'Goldie', '.pets[1].age': 2 }
`

$3

RedisJSON includes commands that can atomically update values in a JSON document, in place in Redis without having to first retrieve the entire document.

Using the JSON.NUMINCRBY command, we can update the age of one of the pets like this:

`javascript
await client.json.numIncrBy('noderedis:jsondata', '.pets[1].age', 1);
`

And we can add a new object to the pets array with the JSON.ARRAPPEND command:

`javascript
await client.json.arrAppend('noderedis:jsondata', '.pets', {
name: 'Robin',
species: 'bird',
age: 1,
isMammal: false
});
``