@cheprasov/jsbt (v1.2.3)

JSBT is a library for serializing structured JavaScript data. The library is JavaScript oriented and tries to resolve JS needs for better data serialization.

Features:

• Super easy to use (serialization works straight away without using any predefined schemas or structure descriptions).
• Supports main JS types: booleans, numbers (as integers or float), bigints, arrays, typed arrays, objects, sets, maps, symbols, dates.
• Allows encode and decode Object Wrappers for primitive values.
• Created for communication between services written at JavaScript / TypeScript. (Node <-> Browser, Node <-> Node, Browser <-> Browser and so on).
• Optimized for performance and compact size.
• Size optimisation for repeated key or values.
• Supports circular data dependencies.
• Supports serialization for linked objects.
• Supports Streams:
  • Supports stream data decoding.
  • Possible to parse message before all data is received.
  • Allows to send several data structures via one stream message.
• It is much powerful than JSON and could replace JSON for communication between microservices.
• Written on TypeScript and supports types.
• Could be implemented by other languages.
• The small library does not have dependencies.

0. Specification

See specification

1. How to install

> npm install @cheprasov/jsbt

import { JSBT } from '@cheprasov/jsbt';

2. Examples

2.1 Encoding and decoding simple data

import { JSBT } from '@cheprasov/jsbt';

const user = {
    name: 'Alex',
    age: 38,
    country: 'UK',
    birthday: new Date('1984-10-10')
};

// Encode
const encodedUser = JSBT.encode(user);

// Decode
const decodedUser = JSBT.decode(encodedUser);

// Yes, it supports Date serialisation
console.log(decodedUser.birthday instanceof Date); // true

2.2 Encoding and decoding data with link refs

import { JSBT } from '@cheprasov/jsbt';
const users = {
    Alex: {
        name: 'Alex',
        age: 38,
        country: 'UK',
        children: null
    },
    Irina: {
        name: 'Irina',
        age: 40,
        country: 'UK',
        children: null,
    },
    Matvey: {
        name: 'Matvey',
        age: 2,
        parents: null,
    },
};

users.Alex.children = users.Irina.children = [users.Matvey];
users.Matvey.parents = [users.Alex, users.Irina];

// Encode
const encodedUsers = JSBT.encode(users);
console.log(encodedUsers.length); // 112

// Decode
const decodedUsers = JSBT.decode(encodedUsers);

console.log(decodedUsers)
console.log(decodedUsers.Alex.children === decodedUsers.Irina.children); // true
console.log(decodedUsers.Matvey.parents[0] === decodedUsers.Alex); // true
console.log(decodedUsers.Matvey.parents[1] === decodedUsers.Irina); // true

2.3 Encoding and decoding instances of a Class

For getting props for Encoding Class Instances it will be used first found of the following methods:

• toJSBT()
• toJSON()
• valueOf()

Instance will be encoded like a object simple with props. Also the decoded object would have configurable, not enumerable and not writable prop __jsbtConstructorName with construcor name of encoded instance.

import { JSBT } from '@cheprasov/jsbt';

export class User {

    protected _name: string;
    protected _email: string;

    constructor(name: string, email: string) {
        this._name = name;
        this._email = email;
    }

    toJSBT() { // or toJSON
        return {
            name: this._name,
            email: this._email,
        };
    }

}

const user = new User('Alex', '[email protected]');

// Encode
const encodedUser = JSBT.encode(user);

// Decode
const decodedUser = JSBT.decode(encodedUser);

console.log(decodedUser);
// { name: 'Alex', email: '[email protected]' }

console.log('Construnctor Name: ', decodedUser.__jsbtConstructorName);
// Construnctor Name: User

3. How to use

3.1 Encoding data

import { JSBT } from '@cheprasov/jsbt';

const userData = {
    name: 'Alex',
    age: 38, 
    country: 'UK'
};

// Encode user data
const jsbt = JSBT.encode(userData);

3.2 Decoding data

import { JSBT } from '@cheprasov/jsbt';

const userData = {
    name: 'Alex',
    age: 38, 
    country: 'UK'
};

// Encode user data
const jsbt = JSBT.encode(userData); 

// Decode user data
const decodedUser = JSBT.decode(jsbt); 

3.3 Decoding stream data

import { JSBT } from '@cheprasov/jsbt';

const stream = new ByteStream();

// on loading add portions of message via stream.addMessages()

const loader = new DataLoader(); // Pseudo loader

// Add loaded data portion to stream
loader.onLoadPortionData((data: string) => {
    stream.addMessages(data);
});

// Add last data portion to stream and mark as received all data
loader.onCompleteLoading((data: string) => {
    stream.completeStream(data);
});

// Decode data via stream
const data = JSBT.decodeStream(stream); // returns Promise and it will be resolved on receiving enough bytes for decoding data structure

Something does not work

Feel free to fork project, fix bugs, write tests and finally request for pull