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@multiformats/multiaddr

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multiaddr implementation (binary + string representation of network addresses)

About

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

Example

import { multiaddr } from '@multiformats/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)

Resolving DNSADDR addresses

DNSADDR is a spec that allows storing a TXT DNS record that contains a Multiaddr.

To resolve DNSADDR addresses, call the .resolve() function the multiaddr, optionally passing a DNS resolver.

DNSADDR addresses can resolve to multiple multiaddrs, since there is no limit to the number of TXT records that can be stored.

Example - Resolving DNSADDR Multiaddrs

import { multiaddr, resolvers } from '@multiformats/multiaddr'
import { dnsaddrResolver } from '@multiformats/multiaddr/resolvers'

resolvers.set('dnsaddr', dnsaddrResolver)

const ma = multiaddr('/dnsaddr/bootstrap.libp2p.io')

// resolve with a 5s timeout
const resolved = await ma.resolve({
  signal: AbortSignal.timeout(5000)
})

console.info(resolved)
// [Multiaddr('/ip4/147.75...'), Multiaddr('/ip4/147.75...'), Multiaddr('/ip4/147.75...')...]

Example - Using a custom DNS resolver to resolve DNSADDR Multiaddrs

See the docs for @multiformats/dns for a full breakdown of how to specify multiple resolvers or resolvers that can be used for specific TLDs.

import { multiaddr } from '@multiformats/multiaddr'
import { dns } from '@multiformats/dns'
import { dnsJsonOverHttps } from '@multiformats/dns/resolvers'

const resolver = dns({
  resolvers: {
    '.': dnsJsonOverHttps('https://cloudflare-dns.com/dns-query')
  }
})

const ma = multiaddr('/dnsaddr/bootstrap.libp2p.io')
const resolved = await ma.resolve({
 dns: resolver
})

console.info(resolved)
// [Multiaddr('/ip4/147.75...'), Multiaddr('/ip4/147.75...'), Multiaddr('/ip4/147.75...')...]

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>

API Docs

License

Licensed under either of

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.