upstream-twenty/packages/twenty-docs/developers/contribute/capabilities/frontend-development/frontend-commands.mdx

---
title: Frontend Commands
icon: "terminal"
---


## Useful commands

### Starting the app

```bash
npx nx start twenty-front
```

### Regenerate graphql schema based on API graphql schema

```bash
npx nx run twenty-front:graphql:generate --configuration=metadata
```
OR
```bash
npx nx run twenty-front:graphql:generate
```

### Lint

```bash
npx nx run twenty-front:lint # pass --fix to fix lint errors
```

## Translations

```bash
npx nx run twenty-front:lingui:extract
npx nx run twenty-front:lingui:compile
```

### Test

```bash
npx nx run twenty-front:test # run jest tests
npx nx run twenty-front:storybook:serve:dev # run storybook
npx nx run twenty-front:storybook:test # run tests # (needs yarn storybook:serve:dev to be running)
npx nx run twenty-front:storybook:coverage # (needs yarn storybook:serve:dev to be running)
```

## Tech Stack

The project has a clean and simple stack, with minimal boilerplate code.

**App**

- [React](https://react.dev/)
- [Apollo](https://www.apollographql.com/docs/)
- [GraphQL Codegen](https://the-guild.dev/graphql/codegen)
- [Jotai](https://jotai.org/)
- [TypeScript](https://www.typescriptlang.org/)

**Testing**

- [Jest](https://jestjs.io/)
- [Storybook](https://storybook.js.org/)

**Tooling**

- [Yarn](https://yarnpkg.com/)
- [Craco](https://craco.js.org/docs/)
- [Oxlint](https://oxc.rs/docs/guide/usage/linter.html)

## Architecture

### Routing

[React Router](https://reactrouter.com/) handles the routing.

To avoid unnecessary [re-renders](/developers/contribute/capabilities/frontend-development/best-practices-front#managing-re-renders) all the routing logic is in a `useEffect` in `PageChangeEffect`.

### State Management

[Jotai](https://jotai.org/) handles state management.

See [best practices](/developers/contribute/capabilities/frontend-development/best-practices-front#state-management) for more information on state management.

## Testing

[Jest](https://jestjs.io/) serves as the tool for unit testing while [Storybook](https://storybook.js.org/) is for component testing.

Jest is mainly for testing utility functions, and not components themselves.

Storybook is for testing the behavior of isolated components, as well as displaying the design system.