multiaddr

js-multiaddr

JavaScript implementation of multiaddr.

Lead Maintainer

Jacob Heun

Table of Contents

• js-multiaddr
  • Lead Maintainer
  • Table of Contents
  • Background
    • What is multiaddr?
  • Install
    • Setup
      • Node.js
      • Browser: Browserify, Webpack, other bundlers
      • Browser: <script> Tag
  • Usage
  • API
  • Resolvers
  • Contribute
  • License

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

Install

npm i multiaddr

Setup

Node.js

const multiaddr = require('multiaddr')

Browser: Browserify, Webpack, other bundlers

The code published to npm that gets loaded on require is in fact a ES5 transpiled version with the right shims added. This means that you can require it and use with your favourite bundler without having to adjust asset management process.

const multiaddr = require('multiaddr')

Browser: <script> Tag

Loading this module through a script tag will make the Multiaddr obj available in the global namespace.

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

Usage

$ node

> const multiaddr = require('multiaddr')

> 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>

API

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

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:

const multiaddr = require('multiaddr')
const resolvers = require('multiaddr/src/resolvers')

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>>.

Contribute

Contributions welcome. Please check out the issues.

Check out our contributing document for more information on how we work, and about contributing in general. Please be aware that all interactions related to multiformats are subject to the IPFS Code of Conduct.

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

License

MIT © 2016 Protocol Labs Inc.