0xbaid / celo-dapp

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Hacktoberfest 2022

Any feature improvement, major bug fix, or new dapp example added to celo-composer during the month of October for #hacktoberfest will be eligible for a 20-100 cUSD prize (based on complexity). Tag devrel@celo.org once you've submitted a PR.

Table of Contents
  1. About The Project
  2. Getting Started
  3. Usage
  4. Roadmap
  5. Contributing
  6. License
  7. Contact
  8. Acknowledgments

About The Project

Celo Composer allows you to quickly build, deploy, and iterate on decentralized applications using Celo. It provides a number of frameworks, examples, and Celo specific functionality to help you get started with your next dApp.

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Built With

Celo Composer is built on Celo to make it simple to build dApps using a variety of front-end frameworks.

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Getting Started

To build your dApp, you'll need to install the dependencies, create a new project, and run the following commands:


  • Node

How to use Celo Composer

The easiest way to get started with Celo Composer is using @celo/celo-composer. This is a CLI tool enables you to quickly start building dApps on Celo for multiple frameworks including React, React Native (w/o Expo), Flutter and Angular. You can create the dApp using default Composer templates provided by Celo. To get started, use the following command:

npx @celo/celo-composer create



  • Select the framework you like and please enter.


  • Enter the project name and the starter project will the create in present working directory.

Get testnet funds and install dependencies

cd hardhat
yarn install
npx hardhat create-account # prints a private key + account
  1. Create packages/hardhat/.env and paste the line containing the private key into it, so it looks something like this:


  1. Fund the account from the faucet here. Once the account is funded, deploy the contracts with:
yarn deploy

Supported Frameworks


  • Creating examples and experiment with React for your libraries and components.
  • Start the dApp with yarn dev/npm run dev and you are good to go.
  • Support for Website and Progressive Web Application.
  • Works with all major crypto wallet.

Check here to learn more about Celo Composer - React

React Native

  • You don't need to configure anything. A reasonably good configuration of both development and production builds is handled for you so you can focus on writing code.
  • Support for Android and IOS.
  • Works with Expo and without Expo.
  • Working example app - The included example app shows how this all works together.
  • Easy to use and always updated with latest dependencies.

Check here to learn more about Celo Composer - React Native


  • One command to get started - Type flutter run to start development in your mobile phone.
  • Works with all major mobile crypto wallets.
  • Support for Android, IOS (Web, Windows, and Linux coming soon).
  • Working example app - The included example app shows how this all works together.
  • Easy to use and always updated with latest dependencies.

Check here to learn more about Celo Composer - Flutter


  • Creating examples and experiment with Angular for your libraries and components.
  • Easy to setup and use.

Check here to learn more about Celo Composer - Angular


  • Edit smart contracts in packages/hardhat/contracts.
  • Edit deployment scripts in packages/hardhat/deploy.
  • Edit frontend in packages/react-app/pages/index.tsx.
  • Open http://localhost:3000 to see the app.

You can run yarn deploy --reset to force re-deploy your contracts to your local development chain.

Deploy Your DApp

This repo comes with a netlify.toml file that makes it easy to deploy your front end using Netlify. The toml file contains instructions for Netlify to build and serve the site, so all you need to do is create an account and connect your GitHub repo to Netlify.

Developing with local devchain

You can import account account keys for the local development chain into Metamask. To print the private keys of the local chain accounts cd /packages/hardhat and run

npx hardhat devchain-keys

If you are working on a local development blockchain, you may see errors about the tx doesn't have the correct nonce. This is because wallets often cache the account nonce to reduce the number of RPC calls and can get out of sync when you restart your development chain. You can reset the account nonce in Metamask by going to Settings > Advanced > Reset Account. This will clear the tx history and force Metamask to query the appropriate nonce from your development chain.

Note: You can get a local copy of mainnet by forking with Ganache. Learn more about forking mainnet with Ganache here.

React library choices

The example UI in packages/react-app uses the Next.js React framework, and react-celo Celo library to get you started with building a responsive, web3 DApp quickly. Feel free to use it as a reference and use whatever web3 packages you are familiar with.

The Graph

Using the Graph is not a requirement for building a web3 application. It is more of a convenience for when your application is reading a lot of data from a blockchain.

Its suggested to only adding support for the Graph when you need it, avoid premature optimization.

The /packages/subgraphs directory includes an example subgraph for reading data from the example Storage.sol contract. The Graph is a blockchain data indexing service that makes it easier to read data from EVM blockchains. You can read more about how the Graph works and how to use it in the README here.

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🔭 Learning Solidity

📕 Read the docs: https://docs.soliditylang.org

📧 Learn the Solidity globals and units


Join the Celo Discord server at https://chat.celo.org. Reach out on the dedicated repo channel here.


See the open issues for a full list of proposed features (and known issues).

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As a contributor, you can add your own dApp to this repository and include it as a tab for others to access. Follow the steps below and reference existing files for additional details to help you get started.

If you decide to try this out and find something confusing, consider opening an pull request to make things more clear for the next developer that comes through. If you improve the user interface or create new components that you think might be useful for other developers, consider opening a PR.

We will happily compensate you for contributions. Anywhere between 5 and 50 cUSD (or more) depending on the work. This is dependent on the work that is done and is ultimately up to the discretion of the Celo Foundation developer relations team.

You can view the associated bounty on Gitcoin here.

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How to Contribute a new dApp

Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!

  • Create a new smart contract in packages/hardhat/contracts.
  • Add a new deployment script within packages/hardhat/deploy/00-deploy.js using the name of your smart contract.
  • Deploy your Smart Contract from within packages/hardhat using yarn deploy
  • Add a new component named ContractName.tsx to packages/react-app/components to create front end of your dApp.
  • Export component using packages/react-app/components/index.tsx using export * from './ContractName
  • Import component to packages/react-app/pages/index.tsx by adding contract to import { ContractName } from "@/components";
  • Add tab within tabs component in packages/react-app/pages/index.tsx and replace # with tab number.
<Tab label="Contract Label" {...a11yProps(#)} />
  • Add tab panel to page replacing # with tab number and ContractName with your smart contract name
<TabPanel value={value} index={#}>
    <GreeterContract contractData={contracts?.ContractName} />

You should now be able to view your new dApp from http://localhost:3000.

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Distributed under the MIT License. See LICENSE.txt for more information.


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License:MIT License


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