@digitalcredentials/cborld

JavaScript CBOR-LD Processor (@digitalcredentials/cborld)

A JavaScript CBOR-LD Process for Web browsers and Node.js apps.

Table of Contents

• Background
• Install
• Usage
• API
• Contribute
• Commercial Support
• License

Background

(Forked from digitalbazaar/cborld v4 to provide TypeScript and ReactNative compatibility.)

This library provides a CBOR-LD Processor for Web browsers, React Native, and Node.js applications.

Install

NPM

npm install @digitalcredentials/cborld

Git

To install locally (for development):

git clone https://github.com/digitalcredentials/cborld.git
cd cborld
npm install

Usage

This library provides two primary functions for encoding and decoding CBOR-LD data.

Encode to CBOR-LD

To encode a JSON-LD document as CBOR-LD:

import {encode, documentLoader} from '@digitalcredentials/cborld';

const jsonldDocument = {
  '@context': 'https://www.w3.org/ns/activitystreams',
  type: 'Note',
  summary: 'CBOR-LD',
  content: 'CBOR-LD is awesome!'
};

// encode a JSON-LD Javascript object into CBOR-LD bytes
const cborldBytes = await encode({jsonldDocument, documentLoader});

To decode a CBOR-LD document to JSON-LD:

import {decode, documentLoader} from '@digitalcredentials/cborld';

// get the CBOR-LD bytes
const cborldBytes = await fs.promises.readFile('out.cborld');

// decode the CBOR-LD bytes into a Javascript object
const jsonldDocument = await cborld.decode({cborldBytes, documentLoader});

API

Functions

encode(options) ⇒ Uint8Array

Encodes a given JSON-LD document into a CBOR-LD byte array.

decode(options) ⇒ object

Decodes a CBOR-LD byte array into a JSON-LD document.

Typedefs

diagnosticFunction : function

A diagnostic function that is called with diagnostic information. Typically set to console.log when debugging.

documentLoaderFunction ⇒ string

Fetches a resource given a URL and returns it as a string.

encode(options) ⇒ Promise<Uint8Array>

Encodes a given JSON-LD document into a CBOR-LD byte array.

Kind: global function Returns: Uint8Array - - The encoded CBOR-LD bytes.

Param	Type	Description
options	object	The options to use when encoding to CBOR-LD.
options.jsonldDocument	object	The JSON-LD Document to convert to CBOR-LD bytes.
options.documentLoader	documentLoaderFunction	The document loader to use when resolving JSON-LD Context URLs.
[options.appContextMap]	Map	A map of JSON-LD Context URLs and their encoded CBOR-LD values (must be values greater than 32767 (0x7FFF)).
[options.appTermMap]	Map	A map of JSON-LD terms and their associated CBOR-LD term codecs.
[options.diagnose]	diagnosticFunction	A function that, if provided, is called with diagnostic information.

decode(options) ⇒ Promise<object>

Decodes a CBOR-LD byte array into a JSON-LD document.

Kind: global function Returns: object - - The decoded JSON-LD Document.

Param	Type	Description
options	object	The options to use when decoding CBOR-LD.
options.cborldBytes	Uint8Array	The encoded CBOR-LD bytes to decode.
options.documentLoader	function	The document loader to use when resolving JSON-LD Context URLs.
[options.appContextMap]	Map	A map of JSON-LD Context URLs and their associated CBOR-LD values. The values must be greater than 32767 (0x7FFF)).
[options.appTermMap]	Map	A map of JSON-LD terms and their associated CBOR-LD term codecs.
[options.diagnose]	diagnosticFunction	A function that, if provided, is called with diagnostic information.

diagnosticFunction : function

A diagnostic function that is called with diagnostic information. Typically set to console.log when debugging.

Kind: global typedef

Param	Type	Description
message	string	The diagnostic message.

documentLoaderFunction ⇒ string

Fetches a resource given a URL and returns it as a string.

Kind: global typedef Returns: string - The resource associated with the URL as a string.

Param	Type	Description
url	string	The URL to retrieve.

Examples:

TBD

Contribute

Please follow the existing code style.

PRs accepted.

If editing the README, please conform to the standard-readme specification.

License

• MIT License - DCC - TypeScript compatibility.
• New BSD License (3-clause) © 2020-2021 Digital Bazaar - Initial implementation.