Installation

npm install json-as

Add the transform to your asc command (e.g. in package.json)

--transform json-as/transform

Alternatively, add it to your asconfig.json

{
  // ...
  "options": {
    "transform": ["json-as/transform"]
  }
}

If you'd like to see the code that the transform generates, run with JSON_DEBUG=true

Usage

import { JSON } from "json-as/assembly";

// @json or @serializable work here
@json
class Vec3 {
  x: f32 = 0.0;
  y: f32 = 0.0;
  z: f32 = 0.0;
}

@json
class Player {
  @alias("first name")
  firstName!: string;
  lastName!: string;
  lastActive!: i32[];
  // Drop in a code block, function, or expression that evaluates to a boolean
  @omitif("this.age < 18")
  age!: i32;
  @omitnull()
  pos!: Vec3 | null;
  isVerified!: boolean;
}

const player: Player = {
  firstName: "Emmet",
  lastName: "West",
  lastActive: [8, 27, 2022],
  age: 23,
  pos: {
    x: 3.4,
    y: 1.2,
    z: 8.3
  },
  isVerified: true
};

const stringified = JSON.stringify<Player>(player);

const parsed = JSON.parse<Player>(stringified);

Classes can even have inheritance. Here's a nasty example

@json
class Base {}

@json
class Vec1 extends Base {
  x: f32 = 1.0;
}
@json
class Vec2 extends Vec1 {
  y: f32 = 2.0;
}
@json
class Vec3 extends Vec2 {
  z: f32 = 3.0;
}

const arr: Base[] = [
  new Vec1(),
  new Vec2(),
  new Vec3()
];

const serialized = JSON.stringify(arr);
// [{"x":1.0},{"x":1.0,"y":2.0},{"y":2.0,"x":1.0,"z":3.0}]
const parsed = JSON.parse<Base[]>(serialized);

You can also add it to your asconfig.json

{
  // ...
  "options": {
    "transform": ["json-as/transform"]
  }
}

If you use this project in your codebase, consider dropping a star. I would really appreciate it!

Notes

If you want a feature, drop an issue (and again, maybe a star). I'll likely add it in less than 7 days.

Contact

Contact me at:

Email: [email protected] GitHub: JairusSW Discord: jairussw

Performance

Run or view the benchmarks here

Below are benchmark results comparing JavaScript's built-in JSON implementation and JSON-AS

My library beats JSON (written in C++) on all counts and, I see many places where I can pull at least a 60% uplift in performance if I implement it.

Note: SIMD is in-development and only available on the v1 branch on GitHub

Serialization Benchmarks:

| Value | JavaScript (ops/s) | JSON-AS (ops/s) | JSON-AS (Pages) | JSON-AS (SIMD+Pages) | Max Throughput | | -------------------------- | ------------------ | ------------------ | ------------------- | -------------------- | -------------- | | "hello world" | 7,124,361 | 44,290,480 (6.2x) | 73,601,235 (10.3x) | NOT IMPLEMENTED | 1.91 GB/s | | 12345 | 9,611,677 | 66,900,642 (6.9x) | 145,924,333 (15.2x) | NOT IMPLEMENTED | 0.58 GB/s | | 1.2345 | 7,227,259 | 20,322,939 (2.8x) | NOT IMPLEMENTED | NOT IMPLEMENTED | 0.16 GB/s | | [[],[[]],[[],[[]]]] | 5,655,429 | 34,453,102 (6.0x) | NOT IMPLEMENTED | NOT IMPLEMENTED | 1.32 GB/s | | { x: f64, y: f64, z: f64 } | 3,878,604 | 44,557,996 (11.5x) | 113,203,242 (29.2x) | 172,023,231 (44.4x) | 8.61 GB/s |

Deserialization Benchmarks:

| Value | JavaScript (ops/s) | JSON-AS (ops/s) | Difference | | -------------------------- | ------------------ | --------------- | ---------- | | "hello world" | 12,210,131 | 24,274,496 | + 98% | | "12345" | 21,376,873 | 254,640,930 | + 1,191% | | 1.2345 | 23,193,902 | 221,869,840 | + 987% | | [[],[[]],[[],[[]]]] | 4,777,227 | 74,921,123 | + 1,568% | | { x: f64, y: f64, z: f64 } | 10,973,723 | 25,214,019 | + 230% |

And my PC specs:

| Component | Specification | | -------------- | ------------------------------ | | Wasmer Version | v4.3.0 | | CPU | AMD Ryzen 7 7800x3D @ 6.00 GHz | | Memory | T-Force DDR5 6000 MHz | | OS | Ubuntu WSL2 |

Issues

Please submit an issue to https://github.com/JairusSW/as-json/issues if you find anything wrong with this library