The repo shows how to connect your React app to StarkNet

by React

StarkNet.js + Cairo + Hardhat + React

This repo shows how to connect your React app to StarkNet.

Scripts helper

mkdir -p build

starknet-compile contracts/cairo/counter.cairo
–output build/counter.json
–abi src/lib/abi/counter.json

export CONTRACT_ADDRESS=0x062f0eab9a09ee676a45211096f4d6b1d70bfd2a43ce8b7df284dd644800d6c3
starknet call
–address $CONTRACT_ADDRESS
–abi build/counter.json
–function getCounter

Content

Contracts

The contracts directory contains a simple Cairo contract:

  • incrementCounter(amount): increment the counter by the given amount.
  • counter(): returns the current counter value.

The contract is deployed at 0x5ee069079158344aef3526153db4ba7a3e39481a285059f21c34c4592ed5b2d
on StarkNet alpha 3.

React

The src/providers directory contains two React providers:

  • BlockNumberProvider: returns the current StarkNet block number.
    • useBlockNumber: returns the current block number. Returns undefined before
      loading the block number for the first time.
  • TransactionsProvider: contains a list of transactions sent to StarkNet.
    The state of this provider is reset between page reloads, for a production
    app you may want to store its state to local storage.

    • useTransactions: returns a list of all transactions.
    • useTransaction(hash): returns the transaction with the given hash, or undefined if
      no transaction matches.

The src/lib/hooks.ts file contains the following hooks:

  • useStarknetCall(contract, method, args): calls the specified method on the contract with the
    given arguments. Returns the raw call output (either a string, an array of strings, or undefined).
  • useStarknetInvoke(contract, method): returns an invoke(args) function to invoke the specified
    method with the given arguments. Also returns an hash that is set to the hash of the most
    recent invoke.

The src/lib/counter.ts file shows how to load a Cairo contract using a React hook.

The src/App.tsx file shows how to use the hooks and providers to interact with the on-chain
counter contract.

License

Copyright 2021 Francesco Ceccon

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

GitHub

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