AEJO

(AJV + Express.js + JSON Schema + OAS 3.x) API Builder

A library for building fully documented and validated Express API endpoints

• Composable functions based on OpenAPI 3.x schemas (fully typed)
• Generates OAS 3.x schemas
• Express.js Param, Query, Body validations via AJV
• Scoped auth strategies

Query Params

// Validate `limit` against `req.query`
Query({
  name: 'limit',
  description: 'max number',
  schema: {
    type: 'integer',
    minimum: 1,
  },
})

Controller

// Define a new controller using the `/api/users` path
Controller({
  prefix: '/api/users',
  // DI express router
  route: (router: Router): AppRoute =>
    Route(
      router,
      // Define a new path under the `/api/users` controller
      Path(
        '/',
        AsyncGet({
          tags: ['users'],
          description: 'List Users',
          // Define path parameters
          parameters: [
            Query({
              name: 'limit',
              description: 'max number',
              schema: {
                type: 'integer',
                minimum: 1,
              },
            }),
          ],
          // Middleware handlers
          middleware: [
            async (req: Request, res: Response, next: NextFunction) => {
              const users = await UserService(req.query)
              res.status(200).send(users)
            },
          ],
          // Endpoint Responses (testable)
          responses: {
            '200': {
              description: 'Success',
              content: UserListResponse,
            },
          },
        })
      )
    ),
})

TODO

• Actual documentation
• Publish npm
• Better OAS support
• More Tests