Dedot

Delightful JavaScript/TypeScript client for Polkadot & Substrate

Dedot is the next-generation JavaScript client for Polkadot and Substrate-based blockchains. Designed to elevate the dapp development experience, Dedot is built & optimized to be lightweight and tree-shakable, offering precise Types & APIs suggestions for individual Substrate-based blockchains and ink! Smart Contracts. Dedot also helps dapps efficiently connect to multiple chains simultaneously as we head toward a seamless multi-chain future.

Features

• ✅ Small bundle size, tree-shakable (no more bn.js or wasm-blob tight dependencies)
• ✅ Types & APIs suggestions for each individual Substrate-based blockchain network (@dedot/chaintypes)
• ✅ Familiar api style with @polkadot/api, easy & fast migration!
• ✅ Native TypeScript type system for scale-codec
• ✅ Compatible with @polkadot/extension-based wallets
• ✅ Support Metadata V14, V15 (latest)
• ✅ Built-in metadata optimization (caching, compact mode ⏳)
• ✅ Build on top of both the new & legacy ( deprecated soon) JSON-RPC APIs
• ✅ Support light clients (e.g: smoldot)
• ✅ Typed Contract APIs
• ✅ Fully-typed low-level JSON-RPC client

Documentation

Check out Dedot documentation on the website: https://dedot.dev

• Getting started
• Interact with ink! smart contracts
• CLI
• Build with Dedot

Example

1. Install packages

npm i dedot # or yarn, pnpm

npm i -D @dedot/chaintypes

2. Connect to the network

import { DedotClient, WsProvider } from 'dedot';
import type { PolkadotApi } from '@dedot/chaintypes';

const provider = new WsProvider('wss://rpc.polkadot.io');
const client = await DedotClient.new<PolkadotApi>(provider);

// Call rpc `state_getMetadata` to fetch raw scale-encoded metadata and decode it.
const metadata = await client.rpc.state_getMetadata();
console.log('Metadata:', metadata);

// Listen to best blocks
client.chainHead.on('bestBlock', (block: PinnedBlock) => { // or 'finalizedBlock'
  console.log(`Current best block number: ${block.number}, hash: ${block.hash}`);
});

// Query on-chain storage
const balance = await client.query.system.account(<address>);
console.log('Balance:', balance);

// Get pallet constants
const ss58Prefix = client.consts.system.ss58Prefix;
console.log('Polkadot ss58Prefix:', ss58Prefix);

// Call runtime api
const pendingRewards = await client.call.nominationPoolsApi.pendingRewards(<address>)
console.log('Pending rewards:', pendingRewards);

// await unsub();
// await client.disconnect();

Resources & announcements

• Introducing Dedot
• Type-safe APIs to interact with ink! Smart Contracts

Acknowledment

Dedot take a lot of inspirations from project @polkadot/api. A big thank to all the maintainers/contributors of this awesome library.

Proudly supported by Web3 Foundation Grants Program.

License

Apache-2.0