@jsheaven/tjson

TJSON is a TypeScript library that extends JSON serialization and deserialization by providing support for additional JavaScript data types such as Date, Set, Map, BigInt, RegExp, and more. This ensures seamless handling of complex data structures that are not natively supported by the standard JSON methods.

User Stories

- As a developer, I want to use TJSON to serialize and deserialize complex JavaScript objects, such as Date, Set, and Map, so that I can maintain data fidelity when working with APIs or saving data.
- As a developer, I don't want to manually handle custom serialization for these non-standard JSON types, so that I can focus on other logic and improve productivity.

Key Features

- Extended JSON Handling: Supports serialization and deserialization of Date, Set, Map, BigInt, RegExp, null, undefined, Symbol, and more.
- Custom converters: Easily register custom converter to extend support for additional types.
- Compact Output: Generates compact JSON strings with metadata for types.
- First-class TypeScript support: Full TypeScript support for safer and cleaner code.
- Lightweight: Small package size with no external dependencies.
- ✅ Available as a simple API
- ✅ Just 1205 byte nano sized (ESM, gizpped)
- ✅ Tree-shakable and side-effect free
- ✅ Runs on Windows, Mac, Linux, CI tested
- ✅ First class TypeScript support
- ✅ 100% Unit Test coverage

Installation

You can install TJSON via npm or yarn:

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`bash
npm install @jsheaven/tjson
`

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`bash
yarn add @jsheaven/tjson
`

Usage

TJSON provides a simple API for converting complex data structures into JSON strings and parsing them back to JavaScript objects.

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#### Stringifying and Parsing Objects

`ts
import TJSON from '@jsheaven/tjson'

// Example object with Date, Set, and Map
const obj = {
date: new Date(),
set: new Set([1, 2, 3]),
map: new Map([
['key1', 'value1'],
['key2', 'value2'],
]),
}

// Stringify the object
const jsonString = TJSON.stringify(obj)
console.log(jsonString)

// Parse it back to an object
const parsedObj = TJSON.parse(jsonString)
console.log(parsedObj)
`

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You can extend TJSON by registering custom Converter for types that are not supported out of the box.

`ts
import TJSON from '@jsheaven/tjson'

const customConverter = {
key: 'js:customType',
is: (obj) => obj instanceof CustomType,
toTJSON: (obj) => {
/ serialization logic /
},
fromTJSON: (json) => {
/ deserialization logic /
},
}

TJSON.register(customConverter)

const obj = new CustomType()

const jsonString = TJSON.stringify(obj)
const parsedObj = TJSON.parse(jsonString)
`

Certainly! Here's the updated documentation with a note indicating that only global symbols are supported in TJSON:

---

TJSON Documentation for Supported Types

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TJSON provides built-in support for several types, including non-standard JavaScript types such as Date, RegExp, Set, Map, BigInt, null, undefined and Typed Arrays. Additionally, TJSON supports global symbols but does not support local symbols. This means only global symbols created with Symbol.for() are supported.

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activate undefined and null by calling the fn

`ts
import TJSON from '@jsheaven/tjson'

TSJSON.registerUndefined().registerNull()
`

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- Supported: Global symbols created using Symbol.for().
- Not Supported: Symbols created using Symbol() (local symbols).

TJSON handles global symbols by serializing them into their unique key representations, ensuring that symbols shared across different parts of the application can be properly serialized and deserialized. Locale symbols are converted to globals

#### Example

`ts
import TJSON from '@jsheaven/tjson'

const globalSymbol = Symbol.for('myGlobalSymbol')
const obj = { sym: globalSymbol }

// Serialize
const jsonString = TJSON.stringify(obj)
console.log(jsonString) // Output: {"content":{"sym":"myGlobalSymbol"},"type":{"sym":"js:symbol"}}

// Deserialize
const parsedObj = TJSON.parse(jsonString)
console.log(parsedObj.sym === Symbol.for('myGlobalSymbol')) // Output: true
`

> Note: Local symbols (those created using Symbol()) are not supported by TJSON because they are inherently unique and not shareable across different realms or contexts, making serialization impractical.

---

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The registerTypedArrays() method in TJSON allows for the serialization and deserialization of several Typed Arrays, which are essential for handling binary data in JavaScript.

#### List of Supported Typed Arrays:

- Int8Array
- Uint8Array
- Uint8ClampedArray
- Int16Array
- Uint16Array
- Int32Array
- Uint32Array
- Float32Array
- Float64Array
- BigInt64Array
- BigUint64Array

#### How to Use registerTypedArrays()

After calling the registerTypedArrays() method, all listed typed arrays can be serialized and deserialized as part of an object or structure.

#### Example Usage

`ts
import TJSON from '@jsheaven/tjson'

// Register Typed Arrays
TJSON.registerTypedArrays()

// Object containing typed arrays
const obj = {
int8Array: new Int8Array([1, 2, 3]),
float32Array: new Float32Array([1.1, 2.2, 3.3]),
}

// Stringify the object
const jsonString = TJSON.stringify(obj)
console.log(jsonString)

// Parse it back to an object
const parsedObj = TJSON.parse(jsonString)
console.log(parsedObj)
`

---

This should provide a clear indication that only global symbols are supported in TJSON, along with documentation on the usage of Typed Arrays and other supported types.

Contributing

We welcome contributions! If you have ideas for new features, find bugs, or want to improve documentation, feel free to open an issue or submit a pull request.

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1. Fork the repository
2. Create a new branch (git checkout -b feature/your-feature)
3. Make your changes
4. Test your changes thoroughly
5. Commit your changes (git commit -m 'Add your feature')
6. Push to the branch (git push origin feature/your-feature`)
7. Open a Pull Request

License

This project is licensed under the MIT License. See the LICENSE file for details.