Resolution

• Installing Resolution
• Updating Resolution
• Using Resolution
• Error Handling
• Development
• Free advertising for integrated apps

Resolution is a library for interacting with blockchain domain names. It can be used to retrieve payment addresses and IPFS hashes for decentralized websites.

Resolution is primarily built and maintained by Unstoppable Domains.

Resolution supports different decentralized domains. Please, refer to the Top Level Domains List

For more information, see our detailed API Reference.

Installing Resolution

Resolution can be installed with either yarn or npm.

yarn add @unstoppabledomains/resolution

npm install @unstoppabledomains/resolution --save

If you're interested in resolving domains via the command line, see our CLI section.

Updating Resolution

Resolution can be updated with either yarn or npm.

yarn upgrade @unstoppabledomains/resolution --latest

npm update @unstoppabledomains/resolution --save

Using Resolution

Initialize with Unstoppable Domains' UNS Proxy Provider

const {default: Resolution} = require('@unstoppabledomains/resolution');

// obtain a key from https://unstoppabledomains.com/partner-api-dashboard if you are a partner
const resolution = new Resolution({ apiKey: "<api_key>" });

NOTE: The apiKey is only used resolve domains from UNS. Behind the scene, it still uses the default ZNS (Zilliqa) RPC url. For additional control, please specify your ZNS configuration.

const {default: Resolution} = require('@unstoppabledomains/resolution');

const resolution = new Resolution({ 
  apiKey: "<api_key>",
  sourceConfig: {
    zns: {
      url: 'https://api.zilliqa.com',
      network: 'mainnet',
    },
  },
});

Initialize with Custom Provider Configuration

You may want to specify a custom provider:

• if you want to use a dedicated blockchain node
• if you want to monitor app usage
• if you already have a provider in your app to re-use it for domain resolution

Default provider can be changed by changing constructor options new Resolution(options) or by using one of the factory methods:

• Resolution.alchemy()
• Resolution.infura()
• Resolution.fromWeb3Version1Provider()
• Resolution.fromEthersProvider()
• etc.

const {default: Resolution} = require('@unstoppabledomains/resolution');

// obtain a key from https://www.infura.io
const resolution = new Resolution({
  sourceConfig: {
    uns: {
      locations: {
        Layer1: {
          url: "https://mainnet.infura.io/v3/<infura_api_key>",
          network: 'mainnet'
        },
        Layer2: {
          url: "https://polygon-mainnet.infura.io/v3/<infura_api_key>",
          network: 'polygon-mainnet',
        },
      },
    },
    zns: {
      url: 'https://api.zilliqa.com',
      network: 'mainnet',
    },
  },
});

Initialize with Autoconfiguration of blockchain network

In some scenarios system might not be flexible enough to easy distinguish between various Ethereum testnets at compilation time. In this case, Resolution library provide a special async constructor await Resolution.autonetwork(options). This method makes a JSON RPC "net_version" call to the provider to get the network id.

This method configures only Uns. Zns is supported only on Zilliqa mainnet which is going to be used in any cases. You can provide a configured provider or a blockchain url as in the following example:

await Resolution.autoNetwork({
  uns: {provider},
});

Examples

To see all constructor options and factory methods check Unstoppable API reference.

Look up a domain's crypto address

function resolve(domain, currency) {
  resolution
    .addr(domain, currency)
    .then((address) => console.log(domain, 'resolves to', address))
    .catch(console.error);
}

resolve('brad.crypto', 'ETH');
resolve('brad.zil', 'ZIL');

Find the IPFS hash for a decentralized website

Create a new file in your project, ipfs_hash.js.

function resolveIpfsHash(domain) {
  resolution
    .ipfsHash(domain)
    .then((hash) =>
      console.log(
        `You can access this website via a public IPFS gateway: https://gateway.ipfs.io/ipfs/${hash}`,
      ),
    )
    .catch(console.error);
}

resolveIpfsHash('homecakes.crypto');

Find a custom record

Create a new file in your project, custom-resolution.js.

function resolveCustomRecord(domain, record) {
  resolution
    .records(domain, [record])
    .then((value) => console.log(`Domain ${domain} ${record} is: ${value}`))
    .catch(console.error);
}

resolveCustomRecord('homecakes.crypto', 'custom.record.value');

Command Line Interface

CLI support was removed from the Resolution library starting from version 6.0. Please use the standalone CLI tool.

Error Handling

When resolution encounters an error it returns the error code instead of stopping the process. Keep an eye out for return values like RECORD_NOT_FOUND.

Development

Use these commands to set up a local development environment (macOS Terminal or Linux shell).

1. Recommended NodeJs version

• Node v16

2. Clone the repository

   git clone https://github.com/unstoppabledomains/resolution.git
   cd resolution

3. Install dependencies

   yarn install

   or

   npm install

Internal config

To update:

• Network config: $ yarn network-config:pull
• Resolver keys: $ yarn resolver-keys:pull
• Both configs: $ yarn config:pull

Unit tests:

Resolution library relies on environment variables to load TestNet RPC Urls. This way, our keys don't expose directly to the code. These environment variables are:

• L1_TEST_NET_RPC_URL
• L1_TEST_NET_RPC_WSS_URL
• L2_TEST_NET_RPC_URL
• L2_TEST_NET_RPC_WSS_URL

In order to validate the code change, copy .env.example file change the name to .env. Then, update the values of variables.

Free advertising for integrated apps

Once your app has a working Unstoppable Domains integration, register it here. Registered apps appear on the Unstoppable Domains homepage and Applications page — putting your app in front of tens of thousands of potential customers per day.

Also, every week we select a newly-integrated app to feature in the Unstoppable Update newsletter. This newsletter is delivered straight into the inbox of ~100,000 crypto fanatics — all of whom could be new customers to grow your business.

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