multiaddr implementation (binary + string representation of network addresses)

• Install
• Lead Maintainer
• Background
  • What is multiaddr?
  • Browser: <script> Tag
• Usage
• API
• Resolvers
• License
• Contribute

$ npm i @multiformats/multiaddr

Jacob Heun

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

npm i multiaddr

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>

// if we are coming from <= 8.x you can use the factory function
const { multiaddr } = require('multiaddr')
const addr =  multiaddr("/ip4/127.0.0.1/udp/1234")
// <Multiaddr /ip4/127.0.0.1/udp/1234>

// or just the class directly
const { Multiaddr } = require('multiaddr')

const addr = new 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>

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

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:

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

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)

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.