rockey2020/js-multiaddr

JavaScript implementation of multiaddr

@multiformats/multiaddr

multiaddr implementation (binary + string representation of network addresses)

Table of contents

• Install
  • Browser <script> tag
• Background
  • What is multiaddr?
• Usage
• Resolvers
• API Docs
• License
• Contribution

Install

$ npm i @multiformats/multiaddr

Browser <script> tag

Loading this module through a script tag will make it's exports available as MultiformatsMultiaddr in the global namespace.

<script src="https://unpkg.com/@multiformats/multiaddr/dist/index.min.js"></script>

Background

What is multiaddr?

A standard way to represent addresses that

• support any standard network protocol
• are self-describing
• have a binary packed format
• have a nice string representation
• encapsulate well

Usage

import { multiaddr } from '@multiformats/multiaddr'
const addr =  multiaddr("/ip4/127.0.0.1/udp/1234")
// Multiaddr(/ip4/127.0.0.1/udp/1234)

const addr = multiaddr("/ip4/127.0.0.1/udp/1234")
// Multiaddr(/ip4/127.0.0.1/udp/1234)

addr.bytes
// <Uint8Array 04 7f 00 00 01 11 04 d2>

addr.toString()
// '/ip4/127.0.0.1/udp/1234'

addr.protos()
/*
[
  {code: 4, name: 'ip4', size: 32},
  {code: 273, name: 'udp', size: 16}
]
*/

// gives you an object that is friendly with what Node.js core modules expect for addresses
addr.nodeAddress()
/*
{
  family: 4,
  port: 1234,
  address: "127.0.0.1"
}
*/

addr.encapsulate('/sctp/5678')
// Multiaddr(/ip4/127.0.0.1/udp/1234/sctp/5678)

Resolvers

multiaddr allows multiaddrs to be resolved when appropriate resolvers are provided. This module already has resolvers available, but you can also create your own. Resolvers should always be set in the same module that is calling multiaddr.resolve() to avoid conflicts if multiple versions of multiaddr are in your dependency tree.

To provide multiaddr resolvers you can do:

import { resolvers  } from '@multiformats/multiaddr'

resolvers.set('dnsaddr', resolvers.dnsaddrResolver)

The available resolvers are:

Name	type	Description
dnsaddrResolver	dnsaddr	dnsaddr resolution with TXT Records

A resolver receives a Multiaddr as a parameter and returns a Promise<Array<string>>.

API Docs

• https://multiformats.github.io/js-multiaddr

License

Licensed under either of

• Apache 2.0, (LICENSE-APACHE / http://www.apache.org/licenses/LICENSE-2.0)
• MIT (LICENSE-MIT / http://opensource.org/licenses/MIT)

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.