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https://github.com/j8r/crystalizer

(De)serialize any Crystal object - out of the box. Supports JSON, YAML and Byte format.
https://github.com/j8r/crystalizer

crystal-lang json serialization yaml

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(De)serialize any Crystal object - out of the box. Supports JSON, YAML and Byte format.

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# Crystalizer

[![CI](https://github.com/j8r/crystalizer/workflows/CI/badge.svg)](https://github.com/j8r/crystalizer/actions?query=workflow%3ACI)
[![Documentation](https://github.com/j8r/crystalizer/workflows/Documentation/badge.svg)](https://j8r.github.io/crystalizer)
[![ISC](https://img.shields.io/badge/License-ISC-blue.svg?style=flat-square)](https://en.wikipedia.org/wiki/ISC_license)

[De]serialize any Crystal object - out of the box. Supports JSON, YAML and Byte format.

## Features

- [De]serialize anything, "out-of-the-box"
- Advanced serialization with annotations, but **not required**
- Shared annotations for all formats (JSON, YAML...)

Implementation bonus: no monkey patching involved :) (no method pollution on objects)

## Installation

Add the dependency to your `shard.yml`:

```yaml
dependencies:
crystalizer:
github: j8r/crystalizer
```

## Documentation

https://j8r.github.io/crystalizer

## Usage

### Basic

```crystal
require "crystalizer/json"
require "crystalizer/yaml"

struct Point
getter x : Int32
@[Crystalizer::Field(key: "Y")]
getter y : String

def initialize(@x, @y)
end
end

point = Point.new 1, "a"

{Crystalizer::YAML, Crystalizer::JSON}.each do |format|
puts format
string = format.serialize point
puts string
puts format.deserialize string, to: Point
end
```

Result:
```
Crystalizer::YAML
---
x: 1
Y: a
Point(@x=1, @y="a")
Crystalizer::JSON
{
"x": 1,
"Y": "a"
}
Point(@x=1, @y="a")
```

### Any

Parsing any type, and converting to JSON/YAML.

```cr
require "crystalizer/json"
require "crystalizer/yaml"

yaml_string = <<-E
one: 1
two: 2
sub:
ary:
- one
- 2
E

yaml_any = Crystalizer::YAML.parse yaml_string
puts yaml_any

json_string = Crystalizer::JSON.serialize yaml_any
puts json_string

json_any = Crystalizer::JSON.parse json_string
puts Crystalizer::YAML.serialize json_any
```

Result:
```yaml
{"one" => 1, "two" => 2, "sub" => {"ary" => ["one", 2]}}
{
"one": 1,
"two": 2,
"sub": {
"ary": [
"one",
2
]
}
}
---
one: 1
two: 2
sub:
ary:
- one
- 2
```

### User-defined serialization

Allows to define custom serialization and deserialization for a given type.

```crystal
struct MyType
include Crystalizer::Type

def initialize(@i : Int32)
end

def self.deserialize(deserializer : Crystalizer::Deserializer)
new deserializer.deserialize to: Int32
end

def serialize(serializer : Crystalizer::Serializer) : Nil
serializer.serialize @i
end
end
```

### Note

Annotations are similar to the stdlib's `Serializable`, but all features are not yet fully implemented.

## License

Copyright (c) 2020-2023 Julien Reichardt - ISC License