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Version: 0.6

Getting Started with WASM

IOTA Identity WASM

This is the beta version of the official WASM bindings for IOTA Identity.

API Reference​

Account Examples​

Low-Level Examples​

Install the library:​

Latest Release: this version matches the main branch of this repository, is stable and will have changelogs.

npm install @iota/identity-wasm

Development Release: this version matches the dev branch of this repository, may see frequent breaking changes and has the latest code changes.

npm install @iota/identity-wasm@dev

Build​

Alternatively, you can build the bindings if you have Rust installed. If not, refer to rustup.rs for the installation.

Install wasm-bindgen-cli. A manual installation is required because we use the Weak References feature, which wasm-pack does not expose.

cargo install --force wasm-bindgen-cli

Then, install the necessary dependencies using:

npm install

and build the bindings for node.js with

npm run build:nodejs

or for the web with

npm run build:web

Minimum Requirements​

The minimum supported version for node is: v16.0.0

NodeJS Usage​

const identity = require('@iota/identity-wasm/node');

async function main() {
  // The creation step generates a keypair, builds an identity
  // and publishes it to the IOTA mainnet.
  const builder = new identity.AccountBuilder();
  const account = await builder.createIdentity();

  // Retrieve the DID of the newly created identity.
  const did = account.did();

  // Print the DID of the created Identity.
  console.log(did.toString());

  // Print the local state of the DID Document
  console.log(account.document());

  // Print the Explorer URL for the DID.
  console.log(`Explorer Url:`, identity.ExplorerUrl.mainnet().resolverUrl(did));
}

main();

Web Setup​

The library loads the WASM file with an HTTP GET request, so the .wasm file must be copied to the root of the dist folder.

Rollup​

  • Install rollup-plugin-copy:
$ npm install rollup-plugin-copy --save-dev
  • Add the copy plugin usage to the plugins array under rollup.config.js:
// Include the copy plugin
import copy from 'rollup-plugin-copy';

// Add the copy plugin to the `plugins` array of your rollup config:
copy({
  targets: [
    {
      src: 'node_modules/@iota/identity-wasm/web/identity_wasm_bg.wasm',
      dest: 'public',
      rename: 'identity_wasm_bg.wasm',
    },
  ],
});

Webpack​

  • Install copy-webpack-plugin:
$ npm install copy-webpack-plugin --save-dev
// Include the copy plugin
const CopyWebPlugin= require('copy-webpack-plugin');

// Add the copy plugin to the `plugins` array of your webpack config:

new CopyWebPlugin({
  patterns: [
    {
      from: 'node_modules/@iota/identity-wasm/web/identity_wasm_bg.wasm',
      to: 'identity_wasm_bg.wasm'
    }
  ]
}),

Web Usage​

import * as identity from "@iota/identity-wasm/web";

identity.init().then(() => {

  // The creation step generates a keypair, builds an identity
  // and publishes it to the IOTA mainnet.
  let builder = new identity.AccountBuilder();
  let account = await builder.createIdentity();

  // Retrieve the DID of the newly created identity.
  const did = account.did();

  // Print the DID of the created Identity.
  console.log(did.toString())

  // Print the local state of the DID Document
  console.log(account.document());

});

// or

(async () => {

  await identity.init()

  // The creation step generates a keypair, builds an identity
  // and publishes it to the IOTA mainnet.
  let builder = new identity.AccountBuilder();
  let account = await builder.createIdentity();

  // Retrieve the DID of the newly created identity.
  const did = account.did();

  // Print the DID of the created Identity.
  console.log(did.toString())

  // Print the local state of the DID Document
  console.log(account.document());

})()

// Default path is "identity_wasm_bg.wasm", but you can override it like this
await identity.init("./static/identity_wasm_bg.wasm");

identity.init().then(<callback>) or await identity.init() is required to load the wasm file (from the server if not available, because of that it will only be slow for the first time)

Examples in the Wild​

You may find it useful to see how the WASM bindings are being used in existing applications: