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node_modules/@redis/json/README.md
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# @redis/json
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This package provides support for the [RedisJSON](https://redis.io/docs/latest/develop/data-types/json/) module, which adds JSON as a native data type to Redis.
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Should be used with [`redis`/`@redis/client`](https://github.com/redis/node-redis).
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:warning: To use these extra commands, your Redis server must have the RedisJSON module installed.
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## Usage
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For a complete example, see [`managing-json.js`](https://github.com/redis/node-redis/blob/master/examples/managing-json.js) in the [examples folder](https://github.com/redis/node-redis/tree/master/examples).
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### Storing JSON Documents in Redis
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The [`JSON.SET`](https://redis.io/commands/json.set/) command stores a JSON value at a given JSON Path in a Redis key.
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Here, we'll store a JSON document in the root of the Redis key "`mydoc`":
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```javascript
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await client.json.set('noderedis:jsondata', '$', {
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name: 'Roberta McDonald',
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pets: [{
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name: 'Rex',
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species: 'dog',
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age: 3,
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isMammal: true
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}, {
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name: 'Goldie',
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species: 'fish',
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age: 2,
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isMammal: false
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}]
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});
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```
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For more information about RedisJSON's path syntax, [check out the documentation](https://redis.io/docs/latest/develop/data-types/json/path).
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### Retrieving JSON Documents from Redis
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With RedisJSON, we can retrieve all or part(s) of a JSON document using the [`JSON.GET`](https://redis.io/commands/json.get/) command and one or more JSON Paths. Let's get the name and age of one of the pets:
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```javascript
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const results = await client.json.get('noderedis:jsondata', {
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path: [
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'.pets[1].name',
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'.pets[1].age'
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]
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});
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```
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`results` will contain the following:
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```javascript
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{ '.pets[1].name': 'Goldie', '.pets[1].age': 2 }
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```
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### Performing Atomic Updates on JSON Documents Stored in Redis
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RedisJSON includes commands that can atomically update values in a JSON document, in place in Redis without having to first retrieve the entire document.
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Using the [`JSON.NUMINCRBY`](https://redis.io/commands/json.numincrby/) command, we can update the age of one of the pets like this:
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```javascript
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await client.json.numIncrBy('noderedis:jsondata', '.pets[1].age', 1);
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```
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And we can add a new object to the pets array with the [`JSON.ARRAPPEND`](https://redis.io/commands/json.arrappend/) command:
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```javascript
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await client.json.arrAppend('noderedis:jsondata', '.pets', {
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name: 'Robin',
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species: 'bird',
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age: 1,
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isMammal: false
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});
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```
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