🚀 zksync-ethers JavaScript SDK 🚀



In order to provide easy access to all the features of ZKsync Era, the zksync-ethers JavaScript SDK was created,
which is made in a way that has an interface very similar to those of ethers. In
fact, ethers is a peer dependency of our library and most of the objects exported by zksync-ethers (
e.g. Wallet, Provider etc.) inherit from the corresponding ethers objects and override only the fields that need
to be changed.

While most of the existing SDKs should work out of the box, deploying smart contracts or using unique ZKsync Era features,
like account abstraction, requires providing additional fields to those that Ethereum transactions have by default.

The library is made in such a way that after replacing ethers with zksync-ethers most client apps will work out of
box.

🔗 For a detailed walkthrough, refer to the official documentation.

📌 Overview

To begin, it is useful to have a basic understanding of the types of objects available and what they are responsible for, at a high level:

- Provider provides connection to the ZKsync Era blockchain, which allows querying the blockchain state, such as account, block or transaction details,
querying event logs or evaluating read-only code using call. Additionally, the client facilitates writing to the blockchain by sending
transactions.
- Wallet wraps all operations that interact with an account. An account generally has a private key, which can be used to sign a variety of
types of payloads. It provides easy usage of the most common features.

🛠 Prerequisites

- node: >= 18 (installation guide)
- ethers: ^6.7.1

📥 Installation & Setup

``bash
yarn add zksync-ethers
yarn add ethers@6 # ethers is a peer dependency of zksync-ethers
`

📝 Examples

The complete examples with various use cases are available here.

$3

`ts
import {Provider, utils, types} from 'zksync-ethers';
import {ethers} from 'ethers';

const provider = Provider.getDefaultProvider(types.Network.Sepolia); // ZKsync Era testnet (L2)
const ethProvider = ethers.getDefaultProvider('sepolia'); // Sepolia testnet (L1)
`

$3

`ts
const blockNumber = await provider.getBlockNumber();
`

$3

`ts
const block = await provider.getBlock('latest');
`

$3

`ts
const PRIVATE_KEY = process.env.PRIVATE_KEY;
const wallet = new Wallet(PRIVATE_KEY, provider, ethProvider);
`

$3

`ts
const ethBalance = await wallet.getBalance(); // balance on ZKsync Era network

const ethBalanceL1 = await wallet.getBalanceL1(); // balance on Sepolia network
`

$3

Transfer funds among accounts on L2 network.

`ts
const receiver = Wallet.createRandom();

const transfer = await wallet.transfer({
to: receiver,
token: utils.ETH_ADDRESS,
amount: ethers.parseEther('1.0'),
});
`

$3

Transfer funds from L1 to L2 network.

`ts
const deposit = await wallet.deposit({
token: utils.ETH_ADDRESS,
amount: ethers.parseEther('1.0'),
});
`

$3

Transfer funds from L2 to L1 network.

`ts
const withdrawal = await wallet.withdraw({
token: utils.ETH_ADDRESS,
amount: ethers.parseEther('1.0'),
});
`

🤖 Running tests

In order to run test you need to run local-setup on your machine.
For running tests, use:

`shell
yarn test:wait # waits for local-setup to be ready
yarn test:prepare # prepares the environment (deploys token on both layers, etc.)
yarn test
`

For running test coverage, use:

`shell
yarn test:coverage
`

🤝 Contributing

We welcome contributions from the community! If you're interested in contributing to the zksync-ethers JavaScript SDK,
please take a look at our CONTRIBUTING.md for guidelines and details on the process.

Thank you for making zksync-ethers` JavaScript SDK better! 🙌