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Version: V3

Quick setup

Semaphore provides an official CLI to set up your project with Hardhat. If your NPM version is 5.2 or higher you can use NPX:

npx @semaphore-protocol/cli@latest create my-app --template monorepo-ethers

Otherwise, install @semaphore-protocol/cli globally and run the create command:

npm i -g @semaphore-protocol/cli@latest
semaphore create my-app --template monorepo-ethers

The supported templates are: contracts-hardhat, monorepo-ethers, monorepo-subgraph.


The semaphore CLI can also be used to get group data from a supported network (e.g semaphore get-groups --network arbitrum-goerli).

To start working on your project, install the dependencies:

cd my-app
npm i


The create command will create a directory called my-app (or whatever name you choose) inside the current folder. That directory will contain the initial project structure, which includes a simple contract, a task to deploy it, some tests and a Next.js application (the web-app folder) to interact with that contract.

├── .yarn
├── apps
│   └── contracts
│ │   └── contracts
| │ │   └── Feedback.sol
│ │   └── scripts
| │ │   └── download-snark-artifacts.ts
│ │   └── tasks
| │ │   └── deploy.ts
│ │   └── test
| │ │   └── Feedback.ts
│ │   └── hardhat.config.ts
│ │   └── package.json
│ │   └── tsconfig.json
│   └── web-app
├── scripts
│   └── copy-contracts-artifacts.ts
├── .editorconfig
├── .env
├── .env.example
├── .eslintignore
├── .eslintrc.json
├── .gitignore
├── .prettierignore
├── .prettierrc.json
├── .yarnrc.yml
├── package.json
└── tsconfig.json

The Feedback.sol contract creates a Semaphore group, allows users to join that group with their Semaphore identity, and finally allows group members to send an anonymous feedback.


Compile contracts

Go to the contracts folder:

cd apps/contracts

And compile your contracts:

npm run compile

Test contracts

Test your contracts:

npm test

Generate a test coverage report:

npm run test:coverage

Or a test gas report:

npm run test:report-gas

Deploy contracts

Follow the instructions below to deploy your contracts:

In the project root folder:

  1. Add your environment variables in the .env file.


    You should at least set a valid Infura API Key (you could use Alchemy as well) and a private key with some ethers.

  2. Go to the apps/contracts folder and deploy your contract.

    npm run deploy -- --semaphore <semaphore-address> --group <group-id> --network arbitrum-goerli

    Check the Semaphore contract addresses here.


    The group id is a number.

Start app

Start the application:

npm run dev