Backend folder structure

├── scripts
├── e2e-test
└── src/
    ├── @types/
    │   ├── knex.d.ts
    │   └── fastify.d.ts
    ├── db/
    │   ├── migrations
    │   ├── schemas
    │   └── seed
    ├── lib/
    │   ├── fn
    │   ├── date
    │   └── config
    ├── queue
    ├── server/
    │   ├── routes/
    │   │   ├── v1
    │   │   └── v2
    │   ├── plugins
    │   └── config
    ├── services/
    │   ├── auth
    │   ├── org
    │   └── project/
    │       ├── project-service.ts
    │       ├── project-types.ts
    │       └── project-dal.ts
    └── ee/
        ├── routes
        └── services

​

backend/scripts

​

backend/e2e-test

​

backend/src

• @types: Type definitions for libraries like Fastify and Knex.
• db: Knex.js configuration for the database, including migration, seed files, and SQL type schemas.
• lib: Stateless, reusable functions used across the codebase.
• queue: Infisical’s queue system based on BullMQ.

​

src/server

• Scope anything related to Fastify/service here.
• Includes routes, Fastify plugins, and server configurations.
• The routes folder contains various versions of routes separated into v1, v2, etc.

​

src/services

• Handles the core business logic for all operations.
• Follows the co-location principle: related components should be kept together.
• Each service component typically contains:
  1. dal: Database Access Layer functions for database operations
  2. service: The service layer containing business logic.
  3. type: Type definitions used within the service component.
  4. fns: An optional component for sharing reusable functions related to the service.
  5. queue: An optional component for queue-specific logic, like secret-queue.ts.

​

src/ee

​

Guidelines and Best Practices

• All services are interconnected at /src/server/routes/index.ts, following the principle of simple dependency injection.
• Files should be named in dash-case.
• Avoid using classes in the codebase; opt for simple functions instead.
• All committed code must be properly linted using npm run lint:fix and type-checked with npm run type:check.
• Minimize shared logic between services as much as possible.
• Controllers within a router component should ideally call only one service layer, with exceptions for services like audit-log that require access to request object data.