# Redwood File Structure

Let's take a look at the files and directories that were created for us (config files have been excluded for now):

├── api
│   ├── db
│   │   ├── schema.prisma
│   │   └── seed.js
│   └── src
│       ├── functions
│       │   └── graphql.js
│       ├── graphql
│       ├── lib
│       │   └── db.js
│       └── services
└── web
    ├── public
    │   ├──
    │   ├── favicon.png
    │   └── robots.txt
    └── src
        ├── Routes.js
        ├── components
        ├── index.css
        ├── index.html
        ├── App.js
        ├── layouts
        └── pages
            ├── FatalErrorPage
            │   └── FatalErrorPage.js
            └── NotFoundPage
                └── NotFoundPage.js

At the top level we have two directories, api and web. Redwood separates the backend (api) and frontend (web) concerns into their own paths in the codebase. (Yarn refers to these as "workspaces". In Redwood, we refer to them as "sides.") When you add packages going forward you'll need to specify which workspace they should go in. For example (don't run these commands, we're just looking at the syntax):

yarn workspace web add marked
yarn workspace api add better-fs

# The /api Directory

Within api there are two directories:

  • db contains the plumbing for the database:

    • schema.prisma contains the database schema (tables and columns)
    • seed.js is used to populate your database with any data that needs to exist for your app to run at all (maybe an admin user or site configuration).

    After we add our first database table there will also be a SQLite database file named dev.db and a directory called migrations created for us. migrations contains the files that act as snapshots of the database schema changing over time.

  • src contains all other backend code. api/src contains four more directories:

    • functions will contain any lambda functions your app needs in addition to the graphql.js file auto-generated by Redwood. This file is required to use the GraphQL API.
    • graphql contains your GraphQL schema written in a Schema Definition Language (the files will end in .sdl.js).
    • lib contains one file, db.js, which instantiates the Prisma database client. You are free to send additional options, if necessary. You can use this directory for other code related to the API side that doesn't fit in functions or services.
    • services contains business logic related to your data. When you're querying or mutating data for GraphQL, that code ends up here, but in a format that's reusable in other places in your application.

That's it for the backend.

# The /web Directory

  • src contains several subdirectories:
    • components contain your traditional React components as well as Redwood Cells (more about those soon).
    • layouts contain HTML/components that wrap your content and are shared across Pages.
    • pages contain components and are optionally wrapped inside Layouts and are the "landing page" for a given URL (a URL like /articles/hello-world will map to one page and /contact-us will map to another). There are two pages included in a new app:
      • NotFoundPage.js will be served when no other route is found (see Routes.js below).
      • FatalErrorPage.js will be rendered when there is an uncaught error that can't be recovered from and would otherwise cause our application to really blow up (normally rendering a blank page).
    • index.css is a generic place to put your CSS, but there are many options.
    • index.html is the standard React starting point for our app.
    • App.js the application component that wraps your entire app
    • Routes.js the route definitions for our app which map a URL to a Page.
  • public contains assets not used by React components (they will be copied over unmodified to the final app's root directory):
    • favicon.png is the icon that goes in a browser tab when your page is open (apps start with the RedwoodJS logo).
    • robots.txt can be used to control what web indexers are allowed to do.
    • explains how, and when, to use the public folder for static assets. It also covers best practices for importing assets within components via Webpack. You can also read this file on GitHub.

Note that there's no web/src/index.js where you'll see a traditional React.render(<App />). Redwood handles this internally for you, but if you need to get inside of that process somewhere to add custom code, you can generate the index.js file with the following command:

yarn redwood setup custom-web-index

Redwood will then use that index.js instead of it's internal version!